You can't increase taxes or exort protection money from client kingdoms. Indeed they are basically alliances with military access who give you all their left-over income. There is no obligation to them, no interesting political stuff to do with them, and we cannot mod it. I still fail to see how it adds anything to the peace game as you are essentially removing a lot of the peacetime stuff and leaving it in the hands of the AI.

As for the crusades thing, you are mistaken. It would not be possible to mod that in. The jihad and crusade mechanics are completely different yet you mix and match the two. Jihads can be called by any faction, but only for their faction (no other faction will join on the Jihad nor necessarily see your Jihad target as a province they even want to conquer), the Crusade can only be called by the papal states faction, the choice of province is set at the beginning of the game and cannot be changed, and factions don't HAVE to go on a crusade. Finally we are using the religion system for something else and using it for this mechanic would be a rather heavy waste of resources.

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