Hey GeorgiaBoy, you are correct about Dafedz's database; I am indeed using it for the game information. However, since there is an update on the way, you might want to stave off modding the game for a while; any game updates will unfortunately overwrite any changes you make.
The random events are NOT yet programmed. Mike has created a rudimentary random event system that will be part of the next update, but it's only capable of generating one random event at the moment. That's why you can't find the Borg information. I also haven't implemented the borg ships yet so you won't be able to find those either!
I've never MADE a technology for the game before so i'm not 100% sure how to do it. The only reason why I even know where the techs are held in the files is because i've had had to fix some tech-related typos, so this guide is based on a lot of assumptions and guesswork based on what I know from making those changes. The editor also doesn't have a section that allows you to make/edit techs, so you will have to do all the work manually. I'll write a guide for you, but give me a few hours to do it coz it's going to be rather a long post, even by my standards!
You should also know that the techs are universal - you can't make a race-specific tech tree, at least not yet, anyways. If you created a tech for the Vorlons, ALL races will be able to research it.