I hope I'm not too late responding to this. The one thing I feel needs addressing is the swarming problem. I know certain players go around cop hunting but the amount of times I've had a two star want and have had 5-10 cops chase after me, ram me down, shoot and tase me is insane.
I think adding a /respond command or a 2 press so certain cops can respond to different crimes (unless they are MW.) This would be better, because as it stands they all seem to go after one person at a time and not really spread out across the map and it makes it a lot less competitive. This would couple well with the chase time system and the bonus for taking down criminals, because the person who responds first would effectively receive the most benefit and other officers would be forced to find someone different to chase.