HalfClip

If possible I think some key points missed so far are:
1: have the NPC cops arrest other NPC's rather than just shooting them. (why R* took that out when they had it for 4 I don't know) As any cops around you will just shoot anyone you try to arrest
2: the NPC cops occasionally drag injured officers to safety, enable the player to do this
3: as a few others have mentioned have a officer down/assistance call so you can use point two!
4: on the police bike change one of the front lights to a blue....its been bugging me, every other vehicle has red and blue lights, as does the rest of the police bike except the front two lights!
those are my ideas but I like the idea of more callouts to robbery's/heists and a lot of the content from bravehart eg ANPR in cars and doing person checks over your radio so you don't always have to go back to your car and can also check pedestrians.