This whole spy thing just doesn't fit into the classic game mode of PTP for me - maybe that's just my opinion. It makes it feel tacky and unnecessarily and somewhat of a gimmick i.e. doesn't add considerable value.
I think time would be better spent by improving the existing classes with more commands specific to their task. One idea that regularly popped in to my mind was that the Police class should be able to place a blockade of some kind (obviously with some restrictions) or terrorists can have sub-classes within with focus on what they want to do. Perhaps one with the current weapons, one that is explosives/heavy based and perhaps something else. Also, civilians should have some different things between them.