1) During a traffic stop, when you accept the license you should need to get back into your patrol vehicle to run the license on the computer, and then reapproach the driver as in real life.
2) More realistic names and a lot of them for more realistic ID's.
3) ID's should also show what state they are from. Most should be local but some could be other states.
4) A button to stop calls from coming in temporarily. (If you only want to work traffic for the time being.)
5) When you arrest someone at gunpoint, instead of them laying on the ground cuffed they should be cuffed and follow you to your police car as they do in a traffic stop arrest.
6) More options for a traffic stop: Reckless/Careless Driving, Impeding Traffic, Speeding 10/25/30+over, Noise Violation (Stereo up too loud), etc as well as the option for $50/$75/$90/$125/$250/$500/$1000 tickets. When you issue a more expensive ticket they should have the possibility of becoming angry and/or violent, but not too often. Gotta keep it realistic..
7) City wide police actions: It would be cool to be driving down a road and see a traffic stop being done by another officer. It would add more realism. If you could somehow program the AI officers to use the mod (not all just a few) then that would be awesome.
8) Status window - A small status window in the bottom right hand corner of the screen that shows the unit number, current location, if we're on a call or not, the location of the call, the type of call, or if we're in a traffic stop.
9) More missions: suspicious activity, fatal car crashes, officer in need of assistance, robbery, domestic dispute, breaking and entering, needing to direct traffic, prostitution, etc. each mission should have different scenarious too.. like hot dog guys dealing drugs, two cars parked next to each other in a dark alley etc.. suspicious activity calls should also have the possibility of turning out to be nothing.. false alarm.. just two scetchy looking fellows talking to each other in an alley or something..
10) SPOTLIGHT. It would be AWESOME if you could have an actual working spotlight in the car.. using the rightmouse/target button to aim the light. and it should stay on when you get out of the car and stay aimed where you aimed ot for traffic stops etc..
11) The ability to go to a police station to get more guns/amo.
If i think of anymore i'll be sure to post them!