Cool idea, but I don't like the thought of it being an FPS for over-achievers... Kind of like no-lifing to get prestige'd in Black Ops...
Good idea, but I'd rather have the current version in which you can enjoy customization without having to put hours and days into the game
Not saying I wouldn't appreciate later ON when the games gets familiar and you want stuff to do...
So yeah, nice idea to think about :3