What I would treasure seeing in a strategy game, particularly in a Cold War context, is a (protected) "Doomsday Switch" which you could activate to shift from conventional to all-out WMD engagement, of course without hope of going back...
With a huge point penaty for the first player who would open-mindedly "go nuclear" to save his face...
Nah, just dreaming, I wouldn't even consider
modelling the precise efects of a tactical nuke in a tactical game...