What could a hypothetical SR3/JNO2 do better than the original?

Terraforming, caves, floating islands, above or below ground water, more realistic orbits possibly, a procedural star cluster, base building, more realistic droods (possibly able to grow in numbers, age (possibly die of old age), food, water, oxygen), mini asteroids that can spawn and be mined for resources (such as fuel? or various metals or stones for building), mining (asteroids and planets), ballast tanks (that can pick up and dump water), balloons, fuel processing, and a way to collect and use atmospheric gases.

TLDR: What features would you like to see that would justify the creation of a new game?