Added AND finished successfully the work on the config file. Perfect with comments and stuff and a in-game config pane. that's a new feature. that's so cool!

src/main/java/de/skate702/craftingkeys/CraftingKeys.java

@@ -1,5 +1,6 @@
 package de.skate702.craftingkeys;
 
+import cpw.mods.fml.client.event.ConfigChangedEvent;
 import cpw.mods.fml.common.FMLCommonHandler;
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.Mod.EventHandler;
@@ -11,6 +12,7 @@ import cpw.mods.fml.common.event.FMLPreInitializationEvent;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
 import cpw.mods.fml.common.gameevent.InputEvent;
 import cpw.mods.fml.common.gameevent.TickEvent;
+import de.skate702.craftingkeys.config.Config;
 import de.skate702.craftingkeys.manager.ContainerManager;
 import de.skate702.craftingkeys.proxies.CraftingKeysProxy;
 import net.minecraft.client.gui.inventory.GuiCrafting;
@@ -22,13 +24,18 @@ import net.minecraft.inventory.Slot;
  *
  * @author skate702
  */
-@Mod(modid = "craftingkeys", name = "Crafting Keys", version = "1.0.0")
+@Mod(modid = CraftingKeys.MODID, name = CraftingKeys.VERSION, version = CraftingKeys.NAME,
+        guiFactory = "de.skate702.craftingkeys.config.ConfigGuiFactory")
 public class CraftingKeys {
 
+    public static final String MODID = "craftingkeys";
+    public static final String VERSION = "1.0.0";
+    public static final String NAME = "Crafting Keys";
+
     /**
      * Current Instance of CraftingKeys.
      */
-    @Instance(value = "CraftingKeys")
+    @Instance(value = MODID)
     public static CraftingKeys instance;
 
     /**
@@ -80,6 +87,12 @@ public class CraftingKeys {
     public void postInit(FMLPostInitializationEvent event) {
     }
 
+    @SubscribeEvent
+    public void onConfigChanged(ConfigChangedEvent.OnConfigChangedEvent eventArgs) {
+        if (eventArgs.modID.equals(MODID))
+            Config.syncConfig();
+    }
+
     /**
      * This method will be executed every Ingame Tick.
      *