I think this change should be assessed on the basis of 1. historicity, 2. gameplay.
Historicity - as I voiced before, the rebellions were ubiquotus and often had serious consequences. So the change is definitely good.
Gameplay - the question is if does change the player's behaviour. If it's not - it's just a annoyance (but not necessarily making the game harder). If it makes the player be more careful with his backyard (eg leaving garrisons or generals behind) or - ideally for me - creates crises that hamper the player runaway expansion - then the change is good.
QS answer hints that indeed the problems are the goal. The question now is if the parameters (eg the size of spawns) is well chosen.
QS - may I have a request to you: could you make a short tutorial how are you making this? I think it might allow us just to make mini-mods hardening the parameters (like Lusitanio does with his submods).
JoC