I dont remember ever having a faction agree to a ceasefire (maybe once). In my present campaign (with limited saves) I've kicked the crap outa numerous German, Spanish, and Julii armies since early in the game and taken cities from all (mostly German). None of those factions will agree to a ceasefire despite being offered by me almost every turn. The Germans are a few steps from elimination and IMO should be begging me for a ceasefire.

I think this is a bug/issue and should go in the list but I think it needs to be discussed a bit first.