There was something bothering me about the wolven winter/murdering winter combo you mention because I know that a while back I tested wolven winter with teleporting SCs and found no temp shift had taken place by the time the SCs arrived, which also made me wonder about using it to shift temp before murdering winter hits (but I don't remember if I ever tested that).
In any case, while searching on that topic I found a thread that addresses the issue as well as the question of unit IDs:
http://forum.shrapnelgames.com/showthread.php?t=47159
Posts 16-19 are the relevant ones.