1. for some reason when you do war against organized state with national territory, sometimes you dont get 101% CP here, preventing you from building crtain structures there - railroad. Building it have great advantages, not only you get max resources from occupied buildings, but fast way how to move troops is unpayable when you deal with constant uprisings.
2. when you occupy some state and on info you see revolt chance 5% in his regions, that statisticaly mean you get revolt/uprising here every 20 turns....but in reality you get one uprising all over place, crus it and one/two turn(s) later after you crued this uprising you get new one. It is great for building up exps for units/leaders, but after some time it gets annoing. Mayby adding some modifier "uprising crushed" making that you will have "peace" (no fear of another big uprising) for say 12 turns will be nice.
3. you cant explore lakes/rivers and regions belonging to another organized state (dosnt matter if he have here (non)natinal soil or just colony).
so far all, cant remeber what i wanted more to write .
4. make in red that some nation declared war on you/ one of your leaders died in battle.