COD4: Sharing Ammo, if your primary and secondary use the same type of ammunition, let them share an ammo pool.
WAW: The ability to unscope sniper rifles in exchange for a slightly longer ADS time.
MW2: Map heights, not saying the maps in the more recent games aren't fun, but if some of them featured multiple levels and dozens of way around the maps, I'd be a happy camper.
BLOPS: Dolphin Diving, at least give us the ability to toggle it or not. Dual Wield primaries, Dual Skorpions and MAC11's FTW. ADS affecting shotgun spread, don't make the hipfire spread larger to compensate, but if someone takes the time to ADS, give them a tighter spread. Non Pistol/Launcher Secondaries, I love my ballistic knife and crossbow.
MW3: I know this is the current one, but bear with me. Specialist, I'd trade helicopters for the ability to gain extra perks, but if this returns, cut Stopping power and Juggernaut, as they would be overpowered.
MW2/Blops: Unlimited Sprint, if you want to be a rusher, give us a Marathon, not ExCon. Launcher Power, I feel launchers and explosives were evenly balanced without danger close or sonic boom, why IW nerfed them even further I'll never know.
Those are my suggestions, what are yours?
N3DS: 2578-3112-7023 GT: ParkourBoyBryan PSN: parkourboy16 Not changing my sig until DICE officially announces Mirror's Edge 2