Not sure if this has been mentioned before but with the recent survey I didnt see it listed.
What I would love to see is more options for ground combat. Perhaps something similar to defensive tactics or even multi-turn invasions.
While the overall space battles seem to be quite well designed I always felt that the ground aspect was overlooked. This is true of most games out there but for the next version it would be quite cool to have some more interaction. My 2 cents...