With regards to one of your other questions, judging by the screenshots it looks like the events that create monarchs will have an option not to use them. Looks like you can chose to make them advisers instead. Yay options.
http://www.europauniversalis4.com/sites/default/files/screenshots/eu4_246.png
http://www.europauniversalis4.com/sites/default/files/screenshots/eu4_244.png
If they have good ruler stats I will choose them to lead every time.