One thing I want to see added is the ability to change what state units are trained in. It's slightly annoying to have to manually change them to defensive from aggressive each time I train a new batch.
The thing that probably needs the most improvement is the unit pathfinding; it's agonizing to launch an attack or order a retreat then watch my units waddle back and forth after each other just because one of them got stuck in a tree or something. This is especially a problem on wooded maps.
Just a quick note, I'm not entirely sure all of the translations for the Mauryans are correct. A temple would be a "mandir", not a "devalaya" which just translates to "god place" in Sanskrit, for example. I can help to some extent with that, but I don't know enough Sanskrit or Prakrit to do the voice overs.