doubt it, Call of Duty is such trash, its already full of hackers and modders, if you really want to waste your time to compete on that game, go for it...it would like be getting a citation for littering in a dump.
Well, you'd get a lot of hatemail, i don't play CoD so i dunno if you'd get banned.
At this point in time, CoD has developed a system to prevent turbo controllers from working. This wasn't the case back in Call of Duty 4: Modern Warfare, as I think I recall seeing videos of modded controllers on that game.
If you do cheat, I'm pretty sure that you'll get banned. This is extremely frequent with the abuse of the emblem creation system. I remember playing Black Ops 1 and reporting many, MANY explicit/hateful emblems.