The mod I created does a number of things. With no human players, making gameplay changes that are annoying or even impossible to deal with becomes a possibility. The goal with the mod was to make the AI more aggressive, more interested in more land, and capable of falling apart if they grew too unstable. I added a new kind of rebel type that works like seperatists but is stronger, has higher morale, and doesn't scatter after losing a battle. I also added an empire collapse disaster which only occurs when a ruler is bad and stability is low.
I also disallowed the AI from taking quantity ideas, to keep the game running faster. The cost to increase development is a base of 500 instead of 100 and the cost to raise stability is 500 as well. All negative stability events are more severe and all unrest ideas are weakened.
It seems like rebels are maybe not the right avenue for empire collapse, there's too much border gore. I have a few ideas though and I plan to try again.
