For those interested, we have a new Alexander Submod being tested on TWC. This version allows you to play as Persia, mainly intended for those who want to try head-to-head against a friend.
You can find it at our TWC Submod Forums. We will have Steam versions of the alternate Alexander submods soon.
I make no promises on the balancing involved since the scenario is heavily weighted against Macedon at the start, but some parts have been changed to help a bit. We also have many future plans for the Alexander Submod as a whole, so check back soon for some previews on various new features!