Oh, and lower aggression of European nations. It is not very realistic to be embroiled in constant wars on a big scale with 3 powers simultaneously from 1100 on since nations didn't really evolve yet so there was a bunch of small fights on a far smaller scale than whole nations against each the other. rebel spawn rate can be upped though...Besides, AI tends to attack even if it is way weaker than you and don't accept ceasfire even if you are hammering them hard and pope is warning with excommunication.

It would be great if some sort of warscore (like in Paradox games) would be introduced. Every battle and every captured town (during war) would influence that WS and it should determine the peacetalks. Only with really high WS you could hold a captured town for good. It was extremly rare for one sie to occupy 3 big towns per war as it is now...