I do hate to extinct factions during my gameplay. Instead i prefer to have them as one-province-vassals. Nevertheless, vassalship doesn't seem to work ok. I have to treat my vassals better than my feared allies. Sooner or later they re-attack.
I would prefer a much tighter way to control my vassals for intance giving them orders or placing one of my nobles as their King even if I have to deal with severe unrest.
I would also like to see the vassal's crest changing into a half-master/half- vassal one.

I know that it will need some original coding this one maybe involving the "papal-izing" of the master nation. As for the crests, I do not have the slightest clue. I certainly don't want to spare any faction slots in order to make these "bastard-kingdoms".

Any ideas (please don't include the when-the-patch-comes steroeotypes, I know I'll have to extensively code AFTER the patch) shall be most appreciated.