Is it possible to make AI vulnerable to revolts ?

I've discovered in the game I'm playing, that AI seem immune to riot and revolt.

Well, I like to wage undercover wars, so I don't like it, to say the least. Is there a way to remove this invulnerability, and make so that AI province can riot and revolt ?


Additionnally, is this possible to alter the size and probabilities of the revolts ?

They are most definatley not immune!!!!!!!
In fact, I have the pooosite problem where the AI keeps losing cities to revolts and rebellions, then they can't take them back because the rebel unit stack is immense.

Well, ok, so it seems that there is a hidden factor concerning AI's revolts.

So the question becomes : what is this hidden factor, and how can we alter it ?

So far all my questions/answers have pointed to the fact this is hardcoded.