My main wish, and it's a pretty simple one, is for drones to be added. I understand that the code is all basically in there, it just doesn't work right yet. I want my tectonic-bomb and plague bomb drones!
Also, I'd like to be able to do something more with asteroids. Stealth space stations, massively armored space stations (how many kt of damage would a kilometer of nickel-iron absorb?
, etc. would be good things to carve into asteroids.