Put config to enable disable [NPC] module.

Default is disabled.  You will need to explicitly enable to toy with this.

OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs

@@ -44,16 +44,19 @@ namespace OpenSim.Region.OptionalModules.World.NPC
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
-        // private const bool m_enabled = false;
-
         private Dictionary<UUID, NPCAvatar> m_avatars = new Dictionary<UUID, NPCAvatar>();
         private Dictionary<UUID, AvatarAppearance> m_appearanceCache = new Dictionary<UUID, AvatarAppearance>();
 
         public void Initialise(Scene scene, IConfigSource source)
+        {
+            IConfig config = source.Configs["NPC"];
+
+            if (config != null && config.GetBoolean("Enabled", false))
             {
                 scene.RegisterModuleInterface<INPCModule>(this);
                 scene.EventManager.OnSignificantClientMovement += HandleOnSignificantClientMovement;
             }
+        }
 
         public void HandleOnSignificantClientMovement(ScenePresence presence)
         {

bin/OpenSim.ini.example

@@ -716,6 +716,12 @@
     ; Enabled = true;
 
 
+[NPC]
+    ;# {Enabled} {} {Enable Non Player Character (NPC) facilities} {true false} false
+    ;; Enable media on a prim facilities
+    ; Enabled = false
+
+
 [PrimLimitsModule]
     ;# {EnforcePrimLimits} {} {Enforce parcel prim limits} {true false} false
     ;; Enable parcel prim limits.  Off by default to emulate pre-existing behavior.

bin/OpenSimDefaults.ini

@@ -1366,6 +1366,10 @@
     ; Enable media on a prim facilities
     Enabled = true;
 
+[NPC]
+    ;; Enable media on a prim facilities
+    Enabled = false
+
 ;; 
 ;; If you are using a simian grid frontend you can enable
 ;; this module to upload tile images for the mapping fn