If there were more crimes, weapons that dont kill, ie. beanbag shotgun, the ability to frisk, walking the person to the car rather then them following you when arrested.
A bank robbery that goes on once in awhile would be cool, since there is a bank, there could be a heist and you have to go after an armored car that is filled with cash while the robbers try to get away. also being able to be a little bad would be interesting, i.e taking bribes, planting evidence.