At least you should make it able to go in the Siege battle with independent people in client state. and can be healed in client state's territory, can enter in its districts. 
the client state of independent people give so much good resources and staragic point, but it's too vulnerable by other culture's seige. because player can't stop that, can doing nothing Even if you put the troops right next to center of independent city. can't do add the battle with joining the seige as the ally does or sending the troops.
you should fix this.

and also there are still problems about stealth&ambush mechanism. at least owner of stealth unit should've choosen whether to start the ambush or not through diplomacy and war situation, view of tactics.

i really like this game and support it. please make it better.