I really don't get why everyone is so obsessed with the chase command. With it you can just kind of go through the motions of the game without a second thought. Without it, it makes you actually work to get tasks accomplished. Most of the police cars are on a cycle script for freeplay. So each time you request a new police car you'll get one of the different cars (for example the NYPD RMP goes crown vic, new impala, old impala, charger, explorer, and then back to the crown vic). This cuts down on the clutter in the menu.