Ghosts is different Engine then mw3 or mw2. Mw2 in game menu (Zero_One was the must for option and easy to use) working 'cuz you add your own code when the game load. Is not like change some byte, you need first decrypt game, then repack it and make the game load it. Activision have spend more money to avoid this then make realy good games ( look at all patch they make after relase of every single game, the worse one was Mw3 with serious SECURITY issue for game client and was no firewall/antivirus able to block it, i mean or you play mw3 or you take care about your pc security).