A couple of other things:

* battlefield defections - eg you could never "play" the Battle of Bosworth properly in MTW as some contingents changed side half-way through. So if somehow bribes could come into effect during the battle rather than on the campmap, so you'd never know until the battle was underway whether the bribe had worked. I know, impossible, but it would be good

* napalm chihuauha catapults