Originally posted by @st
I wouldnt mind playing an actual cop, not really a crooked cop, but one that for some reason has to resort to criminal activity. Then you could do traditional GTA gameplay, but with more emphasis on vigilante missions, by actually doing missions as an officer. They could do more "decisions" by having to choose between killing criminal friends or letting them go.
Plus, we wouldn't have to worry too much about cops actually chasing us which would give us enough room to kill as many people as we like.