diff --git a/Projects/TerraTech/TerraTech/CykUtil.cs b/Projects/TerraTech/TerraTech/CykUtil.cs
index fdcf363..344d199 100644
--- a/Projects/TerraTech/TerraTech/CykUtil.cs
+++ b/Projects/TerraTech/TerraTech/CykUtil.cs
@@ -14,7 +14,7 @@ namespace TerraTech {
             return tank.ControllableByLocalPlayer;
         }
 
-        public static bool IsObjectTank(object obj) {
+        public static Func<object, bool> IsObjectPlayerTank = obj => {
             if (obj == null)
                 return false;
             try {
@@ -23,8 +23,6 @@ namespace TerraTech {
                 Console.WriteLine("Failed to check if object is a player tank: " + e.Message);
                 return false;
             }
-
-            return false;
-        }
+        };
     }
 }
diff --git a/Projects/TerraTech/TerraTech/ModuleBoosterManager.cs b/Projects/TerraTech/TerraTech/ModuleBoosterManager.cs
index 741fbbb..4ce20b5 100644
--- a/Projects/TerraTech/TerraTech/ModuleBoosterManager.cs
+++ b/Projects/TerraTech/TerraTech/ModuleBoosterManager.cs
@@ -11,6 +11,7 @@ namespace TerraTech {
         private static readonly MultipliedObjectManager<BoosterJet> jetManager =
             new MultipliedObjectManager<BoosterJet>(ConfigureJetThruster);
 
+        public static ConfigEntry<bool> playerOnly;
         public static ConfigEntry<float> fanThrustMultiplier;
         public static ConfigEntry<float> jetThrustMultiplier;
 
@@ -18,6 +19,9 @@ namespace TerraTech {
             float min = 0.01f;
             float max = 32f;
 
+            playerOnly = config.Bind("Booster", "Player Only", false, new ConfigDescription("Player Only"));
+            playerOnly.SettingChanged += (sender, args) => DoPatch();
+
             fanThrustMultiplier =
                 config.Bind("Booster", "Fan Thrust Multiplier", 1f,
                             new ConfigDescription("Fan Thrust Multiplier", new AcceptableValueRange<float>(min, max)));
@@ -30,13 +34,19 @@ namespace TerraTech {
         }
 
         private static void ConfigureFanThruster(MultipliedObject<FanJet> obj) {
-            obj.AddField(new FieldConfiguration<float, float>("m_Force", fanThrustMultiplier));
+            obj.AddField(new FieldConfiguration<float, float>("m_Force", fanThrustMultiplier, ShouldApply));
         }
 
         private static void ConfigureJetThruster(MultipliedObject<BoosterJet> obj) {
-            obj.AddField(new FieldConfiguration<float, float>("m_Force", jetThrustMultiplier));
+            obj.AddField(new FieldConfiguration<float, float>("m_Force", jetThrustMultiplier, ShouldApply));
         }
 
+        private static readonly Func<object, bool> ShouldApply = obj => {
+            if (!playerOnly.Value)
+                return true;
+            return CykUtil.IsObjectPlayerTank(obj);
+        };
+
         [HarmonyPrefix]
         [HarmonyPatch(typeof(ModuleBooster), "OnAttached")]
         static void PostfixCreate(ModuleBooster __instance) {
diff --git a/Projects/TerraTech/TerraTech/ObjectFieldMultiplier.cs b/Projects/TerraTech/TerraTech/ObjectFieldMultiplier.cs
index bf6008f..88e7ac6 100644
--- a/Projects/TerraTech/TerraTech/ObjectFieldMultiplier.cs
+++ b/Projects/TerraTech/TerraTech/ObjectFieldMultiplier.cs
@@ -21,6 +21,7 @@ namespace TerraTech {
         private string _fieldName;
         private ConfigEntry<TMul> _defaultMultiplier;
         private Func<object, ConfigEntry<TMul>> _conditionalMultiplier;
+        private Func<object, bool> _applyCondition;
 
         public string FieldName {
             get { return _fieldName; }
@@ -37,6 +38,11 @@ namespace TerraTech {
             set { _conditionalMultiplier = value; }
         }
 
+        public Func<object, bool> ApplyCondition {
+            get { return _applyCondition; }
+            set { _applyCondition = value; }
+        }
+
         public FieldConfiguration(string fieldName, ConfigEntry<TMul> defaultMultiplier) {
             _fieldName = fieldName;
             _defaultMultiplier = defaultMultiplier;
@@ -49,28 +55,54 @@ namespace TerraTech {
             _conditionalMultiplier = conditionalMultiplier;
         }
 
+        public FieldConfiguration(string fieldName, ConfigEntry<TMul> defaultMultiplier,
+                                  Func<object, bool> applyCondition) {
+            _fieldName = fieldName;
+            _defaultMultiplier = defaultMultiplier;
+            _applyCondition = applyCondition;
+        }
+
+        public FieldConfiguration(string fieldName, ConfigEntry<TMul> defaultMultiplier,
+                                  Func<object, ConfigEntry<TMul>> conditionalMultiplier,
+                                  Func<object, bool> applyCondition) {
+            _fieldName = fieldName;
+            _defaultMultiplier = defaultMultiplier;
+            _conditionalMultiplier = conditionalMultiplier;
+            _applyCondition = applyCondition;
+        }
+
         public ConfigEntry<TMul> GetMultiplier(object instance) {
             if (_conditionalMultiplier == null) {
                 return _defaultMultiplier;
             }
             return _conditionalMultiplier(instance);
         }
+
+        public bool ShouldApply(object instance) {
+            if (_applyCondition == null) {
+                return true;
+            }
+            return _applyCondition(instance);
+        }
     }
 
     public class MultipliedField<TField, TMul> : IFieldModifier {
         private readonly string _fieldName;
         private readonly ConfigEntry<TMul> _multiplier;
         private readonly Traverse _parentTraverse;
+        private readonly Func<object, bool> _applyCondition;
         private TField _originalValue;
 
         public string FieldName {
             get { return _fieldName; }
         }
 
-        public MultipliedField(string fieldName, ConfigEntry<TMul> multiplier, Traverse parentTraverse) {
+        public MultipliedField(string fieldName, ConfigEntry<TMul> multiplier, Traverse parentTraverse,
+                               Func<object, bool> applyCondition = null) {
             _fieldName = fieldName;
             _multiplier = multiplier;
             _parentTraverse = parentTraverse;
+            _applyCondition = applyCondition;
 
             if (!parentTraverse.Field(fieldName).FieldExists()) {
                 throw new ArgumentException(
@@ -128,6 +160,12 @@ namespace TerraTech {
 
         public void Apply() {
             try {
+                if (_applyCondition != null && !_applyCondition(_parentTraverse.GetValue())) {
+                    if (Main.debug.Value)
+                        Console.WriteLine("Skipping {0}: condition not met", _fieldName);
+                    return;
+                }
+
                 var newValue = MultiplyValues(_originalValue, _multiplier.Value);
 
                 if (Main.debug.Value)
@@ -160,6 +198,7 @@ namespace TerraTech {
         private string _fieldName;
         private ConfigEntry<bool> _value;
         private Func<object, ConfigEntry<bool>> _conditionalValue;
+        private Func<object, bool> _applyCondition;
 
         public string FieldName {
             get { return _fieldName; }
@@ -176,6 +215,11 @@ namespace TerraTech {
             set { _conditionalValue = value; }
         }
 
+        public Func<object, bool> ApplyCondition {
+            get { return _applyCondition; }
+            set { _applyCondition = value; }
+        }
+
         public BooleanFieldConfiguration(string fieldName, ConfigEntry<bool> value) {
             _fieldName = fieldName;
             _value = value;
@@ -188,28 +232,53 @@ namespace TerraTech {
             _conditionalValue = conditionalValue;
         }
 
+        public BooleanFieldConfiguration(string fieldName, ConfigEntry<bool> value, Func<object, bool> applyCondition) {
+            _fieldName = fieldName;
+            _value = value;
+            _applyCondition = applyCondition;
+        }
+
+        public BooleanFieldConfiguration(string fieldName, ConfigEntry<bool> value,
+                                         Func<object, ConfigEntry<bool>> conditionalValue,
+                                         Func<object, bool> applyCondition) {
+            _fieldName = fieldName;
+            _value = value;
+            _conditionalValue = conditionalValue;
+            _applyCondition = applyCondition;
+        }
+
         public ConfigEntry<bool> GetValue(object instance) {
             if (_conditionalValue == null) {
                 return _value;
             }
             return _conditionalValue(instance);
         }
+
+        public bool ShouldApply(object instance) {
+            if (_applyCondition == null) {
+                return true;
+            }
+            return _applyCondition(instance);
+        }
     }
 
     public class BooleanField : IFieldModifier {
         private readonly string _fieldName;
         private readonly ConfigEntry<bool> _value;
         private readonly Traverse _parentTraverse;
+        private readonly Func<object, bool> _applyCondition;
         private bool _originalValue;
 
         public string FieldName {
             get { return _fieldName; }
         }
 
-        public BooleanField(string fieldName, ConfigEntry<bool> value, Traverse parentTraverse) {
+        public BooleanField(string fieldName, ConfigEntry<bool> value, Traverse parentTraverse,
+                            Func<object, bool> applyCondition = null) {
             _fieldName = fieldName;
             _value = value;
             _parentTraverse = parentTraverse;
+            _applyCondition = applyCondition;
 
             if (!parentTraverse.Field(fieldName).FieldExists()) {
                 throw new ArgumentException(
@@ -240,6 +309,12 @@ namespace TerraTech {
 
         public void Apply() {
             try {
+                if (_applyCondition != null && !_applyCondition(_parentTraverse.GetValue())) {
+                    if (Main.debug.Value)
+                        Console.WriteLine("Skipping {0}: condition not met", _fieldName);
+                    return;
+                }
+
                 if (_value.Value) {
                     if (Main.debug.Value)
                         Console.WriteLine("Applying to {0}: forcing to true", _fieldName);
@@ -287,12 +362,12 @@ namespace TerraTech {
         public void AddField<TField, TMul>(FieldConfiguration<TField, TMul> config) {
             var multiplier = config.GetMultiplier(_instance);
             _fields[config.FieldName] =
-                new MultipliedField<TField, TMul>(config.FieldName, multiplier, _objectTraverse);
+                new MultipliedField<TField, TMul>(config.FieldName, multiplier, _objectTraverse, config.ShouldApply);
         }
 
         public void AddBooleanField(BooleanFieldConfiguration config) {
             var value = config.GetValue(_instance);
-            _fields[config.FieldName] = new BooleanField(config.FieldName, value, _objectTraverse);
+            _fields[config.FieldName] = new BooleanField(config.FieldName, value, _objectTraverse, config.ShouldApply);
         }
 
         public void CaptureFrom() {
@@ -347,7 +422,7 @@ namespace TerraTech {
             try {
                 _managedObjects.Remove(instance);
             } catch (Exception e) {
-                Console.WriteLine(String.Format("Error removing instance from _managedObjects: {0}", e));
+                Console.WriteLine("Error removing instance from _managedObjects: {0}", e);
             }
         }
 
@@ -376,7 +451,7 @@ namespace TerraTech {
                 ApplyTo(instance);
                 multipliedObject.LogValues("Patched");
             } catch (Exception e) {
-                Console.WriteLine(String.Format("Error in OnObjectAttached: {0}", e));
+                Console.WriteLine("Error in OnObjectAttached: {0}", e);
             }
         }
 
@@ -398,13 +473,13 @@ namespace TerraTech {
                         RestoreTo(instance);
                         multipliedObject.LogValues("Restored");
                     } catch (Exception e) {
-                        Console.WriteLine(String.Format("Error restoring values: {0}", e));
+                        Console.WriteLine("Error restoring values: {0}", e);
                     }
 
                     SafeRemove(instance);
                 }
             } catch (Exception e) {
-                Console.WriteLine(String.Format("Error in OnObjectDetached: {0}", e));
+                Console.WriteLine("Error in OnObjectDetached: {0}", e);
             }
         }
 
@@ -420,7 +495,7 @@ namespace TerraTech {
                     RestoreTo(instance, fieldNames);
                     ApplyTo(instance, fieldNames);
                 } catch (Exception e) {
-                    Console.WriteLine(String.Format("Error applying to instance: {0}", e));
+                    Console.WriteLine("Error applying to instance: {0}", e);
                 }
             }
         }
@@ -436,7 +511,7 @@ namespace TerraTech {
                 if (_managedObjects.TryGetValue(instance, out obj))
                     obj.ApplyTo(fieldNames);
             } catch (Exception e) {
-                Console.WriteLine(String.Format("Error in ApplyTo: {0}", e));
+                Console.WriteLine("Error in ApplyTo: {0}", e);
             }
         }
 
@@ -451,7 +526,7 @@ namespace TerraTech {
                 if (_managedObjects.TryGetValue(instance, out obj))
                     obj.RestoreTo(fieldNames);
             } catch (Exception e) {
-                Console.WriteLine(String.Format("Error in RestoreTo: {0}", e));
+                Console.WriteLine("Error in RestoreTo: {0}", e);
             }
         }
     }