Ok, I see a comment and suggestions thread, but it is very specific.
A couple of comments....
They appears to be a pathfinding issue (I guess this might be a bug). I have a general stuck at the town of Wei Xing. I was able to march him there, but I can't see to move him the same way he came in. I can only attack the town, which I do not want to do. Consequently he has been there for most of the game.
I notice that neutral factions or any factions for that matter, can walk with pleasure through your territory with a declaration of war. I noticed in the negotiations you can negotiate military access, but I do not have any treaty of any kind with any faction within my territory. The AI seems to smartly use neutral factions to camp outside of your cities why another faction declares war on you. Generally match you man for men... a full stack will go to a city with a full stack. Perhaps you wanted armies to roam about, but appears the AI is abusing this feature.
Mapping Issue: I would like to see the Han River shown as a navigable river. I believe it will add a little more dynamic of play by having the river be navigable. The Confluence of the Han and Yangtze rivers would become a key strategic point on the map.
That's it for now.... thanks for the hard work!