Theres already a game like that, it's called Postal 2. You run around doing nothing and when ever you want you can just pull out a gun and shoot people, that and GTA III. That kind of interactivity was tried with that "awesome" PC FPS, Jurassic Park: Forgot the Subtitle. You were able to twist and manipulate your arm in real time and it had a very impressive physics engine. But the game bit ass. That was not Jurassic Park, that was Trespasser. I actually owned that game once. Yeah that's it. But its based on the Jurassic Park world. Dreamworks made that train wreck of a game. Yeah, it was heavily based on Jurassic Park. I liked it for a while, since you ACTUALLY had to aim when shooting. I have Postal 2, hell, I reviewed it on the reviews board. Its not realistic at all really. But its the closest thing to what I'm looking for. And I've played that Jurrassic Park game, I'm sorta aiming for something that takes place in a big city or suburbs sorta thing.