I noticed that the red boilder and thermoelectric engine are available at start. Could you put them behind a technology research? I think they have no use on Nauvis and even less on Lignumis that I'm currently testing for compatibility.

They are available at the start to ensure you can use them asap on Corrundum and prepare. I can lock them behind corrundum discovery at least if you insist.

That would be nice. In games where you don't start there, they have no use.

Locked behind planet discovery.