Just a couple of items...
1. In GC3, I believe you could assign multiple planets to the same shipyard. While it is not a huge deal, but it was nice, early game, being able to pool production from several planets to build ships.
2. I wish I could assign colonies to a specific planet, like I can asteroids.
3. Space Elevators - I believe the cost for this improvement was recently bumped to:
2 Durantium + 1Maint. (previously was just 1 Durantium)
I think it is too high now, especially the Maint.
4. I wish my ships would stop movement as soon as they spot an enemy, instead of running right next to them.... to just get killed during their move. (seriously? are you going to make me manually move my ships 1 hex at a time to avoid this? that is so 1990....)
Thank you kindly