Use EvilEd to set up nuclear exchange options, and cascading events which increment the event variable, or rising percentage of total nuclear holocaust, leading to an OD for both players
e.g Each time you use a nuke (and maybe the first player to do so gets a 50% chance of starting the total nuclear exchange, then next time they're used by either player, 15% chance, then 20%, etc. until the game ends normally, or a nuclear holocaust stops the game)
So yeah, some tac nukes fired by NATO to break a Sov echelon might lead you to a conventional victory, but you incur the chance of losing everything also...
Rationale for a 50% chance of holocaust upon first use would be to "model" the shock, and the very real possibility that things escalate real fast...
But once that initial tac strike happened, if the nuclear winter isn't there yet, then chances drop that the next usage will trigger the war, rising again with each further strike.
Or something like that, implemented with a series of events triggering each other.
