I think that spies should be able to move into a foreign city without fear of reprisal at any time. Currently you have to attempt to steal technology. Also there should be a way to counter a particular country covertly. Possibly an assisnate enemy spy type thing. If Russia is annoyingly stealing my techs and I don't want to go to war with them or denounce them publicly, I should be able to at least target there spies. Lastly would like to see an anti coup spy that I can send to a CS just to protect against coups.