It would be interesting to represent the Caucasian War in AoE3, especially Imam Shamil leading Dagestani and Chechen forces against Russia.
I haven’t played the game that much, and have only revolted once (from the Swedes to the United States, my home country), so I can’t go into too many specifics, but I know that Imam Shamil could be a leader ala Simon Bolivar, and Dagestan, unlike its mother nation, would have access to Mosques instead of Churches, which would be interesting.
I wish I had more of a sense of what to offer, but all I have is a rough idea.