I'd like to see deeper loyalty crashes for longer periods of time in newly conquered territories. I find myself racing towards the bloat rebellions just to feel like I'm playing a real empire with all the problems that they would face.

I had an idea to make unique buildings for each faction that radically boost loyalty while simultaneously bumping the 'rebellious factor' for every region by, say, 3. The loyalty buildings would be restricted to the factions' "homelands", so that anyone who conquers would face rebellions while the homeland owner would not. This isn't perfect. But with the current source code it's all there is?