I can see adding a pretender to the Throne with other vassals choosing to take sides, tho in a 400 year long game, there'd be a chance for Civil war about every 30-40 years, way too many times for my liking.
Actually, a kind of rebel prince after every succession is historical.
At least for Hungary it is!
I mean the main reason why the Árpád dynasty ended was that the rebel princes were executed/blinded/emasculated to end the threat.
After a while there were simply very few Árpád's were left, and since they were not really a healthy type (we have maybe 3-4 Árpád's who lived for 50 years), this lead to 'end of the line'.
I think this would be not hard to implement: when someone drops in the line of succession, gets a rival trait against the guy who entered the line before him.
Of course we would need an option to blind/inprison/emasculate/execute these rebels
Also, what I would like to have is a kind of administrative title to model the hungarian feudalism.
There were no inheritable duchy titles, but the king named men (bán in slavonia, vajda in Transsylvania, ispán in lots of places) to administer parts of the country for him. The king got 2/3, the administrative guy got 1/3 wealth.
These folks were moving continously, for example a good 'steward' was sent to improve a poor region, when he was done, he was sent somewhere else. A good soldier was sent to a place where his combat skills could be put to good use (most of the time Byzantine border or Transsylvania).
This is hard to represent in CK at present, because:
- their heirs shouldn't inherit the region
- the king should be able to remove them without loyalty issues to other guys
- they shouldn't revoke titles
This was the hungarian way of feudalism till II. András (who participated in the fifth crusade), who was the first to give out inheritable duke titles.