Yes, the remensa rebellion is already in some sort in ARG, but it is always worth reviewing those events and changing the description to put them into an European perspective.
About seizing control, I am unsure. They all failed to do anything but cause trouble, but it would be nice to have the option to chose between increase free subjects versus to enserf them further. As a general rule, countries with strong monarchies (high centralization, low aristocracy) had happier peasants, while in countries with weak monarchies, the nobles run unchecked crushing the peasants rights, and rebellions took place.