I've just become Emperor as Navarre for the first time, so I'm just discovering the new diplomatic options. A few questions:
1.) I understand that "Enforcing Religious Unity" whether through peace deals or diplomacy gives me Imperial Authority. Current IA is at 1, the Reformation is in full swing at 1512. I figured I should wait around a bit for it to calm down before I start requesting countries to convert, since I lose (10 IA?) points for every conversion away from my religion (Catholism). At what point does the Reformation stop/how long should I wait before I start converting?
2.) I want to change into a Republic - I'm really disliking Monarchies. Will I be able to change to a Republic and stay as Emperor after I pass the "Proclaim Erbkaisertum" reform?
3.) What's this business with Emperors, IA and Hordes?
4.) Do I lose relations with other HRE members if I attack a HRE member as Emperor? I'm not in the Empire.