I am currently playing Supernova 1.51.375185.1 under Epic Games.
I must have researched Drive System optimization at least 5 times, maybe more. here are a couple of save files from the same game where I am researching it again.
I seem to remember there are certain "capstone" techs at the end of particular branches. I believe these are repeatable. If you open the tech tree and look at drive optimization you might see this
Sadly it doesn't give you the extra moves past the first time you research it! /bug
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