Crusader Kings II

[Double A]

I had to switch from Ireland to Portugal, create about 3 titles, and switch a few vassals around to prevent 21 rebellions. Only had 3. Yay?

Anyway, main problem is that culture is German. I got my son to be Irish, but on the other hand, once he becomes king, I've figured out that I'll lose all my wonderful (and expensive) jousting lists. If I add "culture = irish" to all the lists in the text file, will I be able to retain my fancypants German buildings instead of having them magically go poof, do I need to add more somewhere, or will my changes be savegame incompatible and I'm just wasting my time?

And regarding Germans... how do I convince everyone to vote for me as the Holy Roman Emperor? I have a duchy in it, and apparently have a vote. Everyone seems to like me.

Also, why do vassals rebelling for independence always demand that I lower crown authority to 0 every time they rebel? If they didn't, I might even let one slip through my fingers.