What game are you playing?What I'd like to see in the future are:
I. Reworked Emperor/Empire mechanics: HRE too strong, Byzantines(?), more possible empires
IA. Holy Roman Empire: it's too powerful and stable
In any I had so far, the HRE always ends up being eaten up by Civil War - with all the other European Powers cheerfully preying Duchies off it's borders.
100 years into the game, the Emperor has a hard time fighting offensive wars at all, being so bled out from fighting his own Dukes. That's really a special kind of "stable and powerful"...