my settings were normal, everything on manual. I was browsing the defines.lua this morning and saw something about 300IC being a threshold for increased threat ( if anyone can confirm or deny?), so grabbing London would have put me over that mark. is it related? I don't think so. When I checked SU pre-DoW (after the facts), it turns out they had the same "countdown" that Germany does for breaking the NAP.
so I CAN say that having more troops on the border seems to enable SU to DoW Germany.
@Jazumir: I always felt better having the West quiet before unleashing storm in the East. given Podcat's post, that seems no longer to be a possibility. that's okay, really. playing the US, for instance, by the time they get into the war, the AI always had the British isles in their pocket. These changes make for a more historic game (which is my personal preference).