How would you guys like conversion to be handled in Crusader Kings II? Should lords have the option to convert to other religions? Should lords be able to force convert their enemies in a peace deal? What about captured fiefs which belong to a different religion? What should be the process in converting non-believers to your lord's faith?
I'd like to be able to have some ahistorical fun with this. Maybe play as the Byzantines and accept the primacy of the Bishop of Rome and play a Catholic Byzantium. It might also be nice to be able to convert some of the more fickle Muslim Emirs to Christianity (but there should be a zealous trait which makes it so some lords will never convert and would rather die for their faith instead). Converting the people of fiefs should be handled differently than in EU3 if possible. I was never very fond of the EU3 conversion system where you just planted a missionary and waited for the conversion event to randomly fire. It's been a while but I think the original CK had fiefs changing religion solely based on a conversion event randomly firing as well but without even the missionary mechanic to give you some influence. I'm not sure what the practical alternative to random event based conversion would be though. Maybe there could be different methods of converting fiefs like force converting a province through coercion which would convert provinces faster but with a nasty super penalty to growth and income until conversion is complete? Maybe you could get a really charismatic Bishop who could speed up conversion and peacefully at that. I don't know. I'd just like a system that gets the player more involved than simply pushing a button and waiting for an event to fire, you know?