Perhaps this is just a fanboy´s wishful thinking but I would love to see the Greco-Bactrian Kingdom in the mod. The current map engulfs most of the bactrians western posessions (perhaps even the important bactrian city of Demetrias) and I think it would more of a challenge for both Parthians and the Seleucids (more for the Parthians) in the war ofr the East, besides it would offer the players with an awesome variaty of both Eastern, Nomadic and Hellenistic Units.
Again, this is probably already been considered and discarted, and its quite unlikely to be aadressed. But well I just wanted to give it a try...