Thinking about how to quickly cycle service types while on the move...can a service type be associated with a quick key? Maybe one for CB channels, one for EMS, another for public safety.......
Nope. The only thing you could possible do is arrange/re-arrange your Favorites List(s) so that CB channels is in its own Favorites List, EMS is in another Favorites List, Public Safety in another Favorites List, etc.
I first thought about suggesting that, but got to thinking a few more key presses are needed. The OP mentioned "On the move" so for driver attention purposes, I thought Favorites Lists would be the better way.