How about this?
Spies could be trained as weapons destruction specialists or as assassins.
Weapons destruction specialists could have a speciallity in either attack or defense weapons.
Assassins could have an option for targeting other spies, or targets of opportunity as in untrained, trained, mercs whatever. Call them cold hearted murderers if you wish, as apposed to the "civil" assassins that slaughter other spies.
To balance it out, assassins shouldn't be sent on recons, lets face it, they are cold hearted killers and weapons destruction specialists shouldnt be sent on "subdue" missions.
The type of spies one has may never need to be displayed in a recon mission, just the number.
Mathematically is shouln't be too hard to ballance it out.
It would add an element of surprise and a way to better control the potential abuse of covert capacity, with an added twist in that there will an added risk in sab attacks.
Just a thought, hope it is supported or improved apon.
