Awesome update! To make it fair for both sides, i think that you could remove the blue dot of the cops from the minimap.
Nah, the cops are meant to be marked (they're in uniform after all).
As for the penalty for killing non-suspects, obviously if you have no name colours then it should be removed if they are in combat (as Teddy said he had added). However, this must come with the caveat that basically unsuspected people be absolutely allowed to open fire on cops, since the same would be true in reverse the moment a suspect fires a weapon (at anyone or anything). It's not a big deal in theory, it's just on the cops to not whine about DM.