I also would like to thank you Quin, in my last playthrough the Pope sent me a message and granted me an audience. He asked me if I would like to lead the Crusader Army, I accepted and traveled with the Crusaders to the Holy Land. After a short siege, we managed to take the city and I became an independent ruler, because I had no allegiance.
What I liked most, that I could hire a lot of crusader troops in the camp almost for free. It was still early in the game and I had no big army, but funds to keep one for a few weeks. And the fact that you can't use crusader troops after the crusade is over is a wonderful idea. Thank you for coding all these things.