Tourism and trade income needs to go up.
I don't think the Yor need an economic building perse- but the idea of giving them a small economy bonus to the factories is more than appealing. I may have to do that tonight and see how it plays out. Normally I just tech-trade for the economy building techs - even though I shouldn't need to, I just enjoy the Yor too much (they're one of the few non-custom races I'll play.)
I'd love to play the Korx more if those trade route incomes go up - same for the Kyrnn if Tourism is buffed.
Buff the starbases.
Give me the option to tell you that yes, I accept liability for an unstable experience and really crank up the number of stars and planets in Gigantic and bigger maps. My quadcore can handle it, man! The idea of an immense map populated to the brim that takes a month to play on slow tech speed with maximum extreme planets makes my mouth water.
YES, YES, A THOUSAND TIMES YES to the ability to open any map in the editor and toy with things.
AI suprise attacks would be great. And teach them how to invade, how to prioritize, and how to scrub my planets of defenders the turn they intend to invade, not while the transport is still six weeks away from the star (maybe make them fleet the things more?) and giving me little more than a warning they intend to be a little mean.