I wanna see a game in an open sandbox world like GTA where you are a full time cop. Where you drive or walk around, stopping crime if you see it, say you see a man steal a womans purse as your driving down the road. Or respond the calls on your radio. Anything from a home invasion to a bank robbery.

You get there first, do you call for backup and wait? Or do you go in? The hostage might die if you wait, but you might die if you go in. Maybe have a "career" mode version where you try to follow the book and move up in the ranks with the ultimate goal of a certain rank. And then having a free mode where you can turn rules on and off. For example pulling a woman over for speeding and then pulling her out of her car and beating her to death would probably be the end of your career if you get caught, but in free mode you can turn such rules off.

I think it would be kind of fun.