So basically, I want to add a tech to the tree of all the races, and the most efficient way to do that is to add it to TechTree.xml and then add the relevant short entries to the racial tech trees.
Only trouble being (and I know, this has been a problem since release but it's only now becoming frustrating) first of all the tech tree editor refuses to even open TechTree.xml, and second of all when you load a racial tach tree it refuses to look at your modded TechTree.xml so the description for a completely new tech is not loaded.