Aimbot is awesome... for all the noobs who can't aim.
Just make something like @flameswor10 makes/made. Nothing too obvious. Chams, No Spread/Recoil/Sway, Superbullets/FMJ, Fly (for Fireteam) and if possible, just for the hell of it... Unlimited Ammo. That's like the ultimate set of obvious but fun hacks.