Start on any of the first three planets: Vulcanus, Gleba, or Fulgora.
Choose your planet in the startup mod settings before starting a new game.
Compatible with many modded planets!
Would it be possible to move the Steam Turbine to somewhere on the tech tree where it can be unlocked while still on Vulcanus? I prefer to use it for power there later on via acid neutralisation, but it seems i'd have to wait until I go to Nauvis and unlock uranium processing/nuclear power.
Perhaps, I thought about it but couldn't decide where exactly it would fit in the tech tree since I didn't want the player to necessarily have access to them immediately. I'll think about it though, and maybe I'll change it.
I just put this on another thread before seeing this one: Uranium Processing is gated behind mining uranium ore. changing it to a normal research along the other nuclear tech would be a simple fix, its only blue science now so it would unlock them soon enough to matter.