From: California, USA
Terraforming, Ringworlds, sphereworlds(Dyson spheres) would be great but the current technology tree suggests only incremental advances as if like a WW2 game. Of course, another expansion could change every thing.
Also, please, Orbital Rings(like in The Culture novels and others), Orbital Spheres, and ships as population centers like in The Culture. Ships and Orbital Rings are their greatest percentages of population centers. Planets are like back country villages, research stations, and nature preserves.
See my signature below. Lol.
Wish list:population centers beyond planetary(http://en.wikipedia.org/wiki/The_Culture):Ships,Ring Orbitals,Sphere Orbitals,Ringworlds,Sphereworlds;ability to create & destroy planets,population centers,stars;AI competently using all advances & features.