First of all, thank you so much for your awesome work, i really like this mode.
My suggestion is that every class of cops have it own callouts, it's funny that you spawn as an FBI and you recieve a callout about hobos causing troubles lol, while the job of FBI is to arrest most wanted criminals. Same for N.O.O.S.E, they should only be called if there is terrorists attack or gang activities. That will make N.O.O.S.E and FBI choosed more often, so what about an unlocking system? you only get powerful class after you complete a number of callouts with the previous class, here an exemple:
LCPDs: nothing required
N.O.O.S.E: 50 callouts completed with LCPDs
FBI: 50 callouts completed with N.O.O.S.E
Sorry if there is grammar mistakes, i am not good with english.