Like I said in the other thread, ask this on the GalCiv 3 forum, if you want to help the devs. You have much better chances of getting replies.
As for modifying the Dread Lords or minor race tech trees, you can do this either via the supplied Tech Editor or by using a text editor. Both ways have their pros and cons. I personally prefer to use a text editor (Notepad++), because I find it much easier to work with.
