Love the mod! It really adds a lot of variety to lesser represented parts of the world. Great work!
Just a few bugs/issues I've noticed in a limited number of playthroughs:
-The reducing culture bug. I know this has been brought up with regards to Yemen, but I don't know if it's been resolved yet. My case is a game as Russia where I put the culture slider to max, built culture in my cities, and still had reducing culture, so my borders would never expand and I was swallowed by Ukraine's culture. (As a side note, the decrease time frame to settle Siberia and the increased number of neighbors and rivals really increases Russia's difficulty. Not necessarily a bad thing!)
-Whenever I play as Nubia, I rush 1 Medjay and take Egypt ASAP. However, once I take Egypt, I can't select new production in any city and when my last production finishes and the game wants to prompt for new production, it crashes. I don't know if this is linked to Nubia, but it is very consistent for me.
-I can't play as the Teotihuacanos, it always crashes in auto-play
-One time when I played as the Mamluks, there were three cities in my flip zone that were placed in such a way that they completely excluded the settling of Cairo. Once they flipped to me, I don't think there's anything I could do? I don't think you can trade away your core cities, right (with the intention of then reconquering and razing)? Even if you could, that would delay the settling of Cairo so long that the difficultly spikes a lot for that random case. The only other thing I think could be done is try to raze one on turn one, but I didn't start with enough units or any siege units, so it was very unlikely.
Once again, great work! I look forward to future installments, especially when the big map rolls around.