Scene.Systems keeps track of it's booted, so plugins know how to respond to the boot event (or not). You can now also load a plugin into a Scene at runtime.

src/plugins/PluginManager.js

@@ -7,7 +7,7 @@ var PluginManager = new Class({
     initialize:
 
     //  The PluginManager is global and belongs to the Game instance, not a Scene.
-    function PluginManager (game, config)
+    function PluginManager (game)
     {
         this.game = game;
 
@@ -45,6 +45,7 @@ var PluginManager = new Class({
     {
         var scene = sys.scene;
         var map = sys.settings.map;
+        var isBooted = sys.settings.isBooted;
 
         for (var i = 0; i < scenePlugins.length; i++)
         {
@@ -53,13 +54,21 @@ var PluginManager = new Class({
             var source = plugins[pluginKey];
 
             // console.log('PluginManager.local', pluginKey, 'to', source.mapping);
+
+            var plugin = new source.plugin(scene);
             
-            sys[source.mapping] = new source.plugin(scene);
+            sys[source.mapping] = plugin;
 
             //  Scene level injection
             if (map.hasOwnProperty(source.mapping))
             {
-                scene[map[source.mapping]] = sys[source.mapping];
+                scene[map[source.mapping]] = plugin;
+            }
+
+            //  Scene is already booted, usually because this method is being called at run-time, so boot the plugin
+            if (isBooted)
+            {
+                plugin.boot();
             }
         }
     },

src/scene/Settings.js

@@ -27,6 +27,8 @@ var Settings = {
             active: GetValue(config, 'active', false),
             visible: GetValue(config, 'visible', true),
 
+            isBooted: false,
+
             //  Loader payload array
 
             data: {},

src/scene/Systems.js

@@ -1,7 +1,5 @@
 var Class = require('../utils/Class');
 var CoreScenePlugins = require('../CoreScenePlugins');
-var EventEmitter = require('eventemitter3');
-var GetFastValue = require('../utils/object/GetFastValue');
 var GetPhysicsPlugins = require('./GetPhysicsPlugins');
 var GetScenePlugins = require('./GetScenePlugins');
 var GlobalPlugins = require('../GlobalPlugins');
@@ -47,8 +45,6 @@ var Systems = new Class({
 
     init: function (game)
     {
-        var scene = this.scene;
-
         this.game = game;
 
         game.plugins.installGlobal(this, GlobalPlugins);
@@ -60,6 +56,18 @@ var Systems = new Class({
         game.plugins.installLocal(this, GetPhysicsPlugins(this));
 
         this.events.emit('boot', this);
+
+        this.settings.isBooted = true;
+    },
+
+    install: function (plugin)
+    {
+        if (!Array.isArray(plugin))
+        {
+            plugin = [ plugin ];
+        }
+
+        this.game.plugins.installLocal(this, plugin);
     },
 
     step: function (time, delta)