I suspect that would be a question for MM.
However as OT, I wish there were more None's in the research tree. One of the things that originally drew (drawed, drawn, ?) me to the SE games was learning the tech tree. I can remember the first time I finally figured out that to get WMG's you had to research another tree to a certain level....Ahh, the good ole' days...
I purposely didn't look for tech tree maps and such 'cause finding the stuff was half the fun.
My whole point is that it would (IMO) be cool if there were random tech tree crossing. Probably be a bear to program (with the techs being so moddable), but cool nevertheless...