There should be a timer before secessions are possible

[Dman1791]

Because otherwise it's possible for Brunei to break away 2 months after you conquer them. There's nothing that can be done but hope that the secession doesn't fire, since you're going to have the turmoil for it due to having just conquered them.

 

[Kyoumen]

At this point that's practically the only time secessions do fire, though.

 

[Froonk]

Rather than an arbitrary timer on secessions, it should only be possible for a movement to secede after organizing sufficiently in terms of manpower and mobilizing the population. A recently conquered population whose army got defeated and whose territory got pacified shouldn't be able to organize and mobilize immediately.