Well, I guess this might work for a suggestions forum, too :S
Anyhow, here are a few ideas that I think should be implemented (Yes, all in one topic this time )
Recruiting police officers off of the street
This idea kind of comes from GTA:SA. In that game, you were able to recruits gangsters off of the streets to your "gang", and you had a cap on how much you could recruit. I'm not asking for all of that, I'm just asking that if we are looking at a police man on the street, and we press F5, then he joins the player, and follows them. (Also, as a bug, recruited cops don't leave you if you exit the mod.)
Start a traffic stop by standing next to a car
Just to ask people to get out of their vehicles.
Disable police "flashing their lights" while a cop
If you drive by a police car at a fast speed, they will flash their lights/sirens at you. That doesn't really make sense being a cop, since you're on their side.
Anyways, I hope these ideas get implemented!
~TGP1994