I'm waiting for your ideas

I think everyone has come across the fact that your leader will always rule your country during the game, regardless of ideology and time.My question is how to replace the ruler with the help of events or something else during the game?

I am trying to make a custom scenario and when I open "Manage Civilizations" it sends me to the main menu. I been messing around with files for the scenario and I think I accidently deleted something I was not suppose to. I tried uninstalling then reinstalling the game multiple times yet I have the same problem. Has anybody ran into this problem? and if they did how did they fix or at least find a way around it?

Hi, I have problem. i installed mod world + full version and got into the game and played normally.  after exiting the game I wanted to start it again but the game started loading at the beginning and when it reached the end it just shut down.  since then it happens to me every time.  does anyone know how to solve this problem?  thanks 

I made a scenario in which the vassal was stronger than the lord.  How can I make it so that he doesn't declare independence?  This usually happens in 40-50 moves.  I don't want to make it weaker.  Maybe this can be done somehow using events?