This may sound pretty stupid, but I'd like the ability to actually do what normal peds do, like talk to eachother, sit on benches, read papers etc... Once you've completed a GTA game, especially GTA IV, it tends to get pretty boring, so maybe tiny features like these might make things more interesting? And possibly during combat, make it possible for us to grab enemy guns out of their hand, like a close combat sort of minigame where you have to grab the gun from their hand - similar to that used in games like Hitman: Blood Money etc...