I just discovered this thread! This looks like it's going to be totally amazing, TheLopez. The Civ4 community bows down in a chorus of "We're not worthy!"
As far as having an automated "Delete Tech" function, hmm, well, it seems like a lot of work for something that's easy to do in the xml file: Re-name the existing tech, then re-position it on the tree using your editor. Seems easy --- unless I'm missing something?
"Yeah I can wait too. Deleting something like Future Technologies for a MOD game based on fantasy would be good lol."
Also, you don't have to delete inappropriate techs from your mod, either. Just re-name them to something that's thematically consistent. For example, in a fantasy mod, "Future Tech" could be renamed "Second Age Magic" -- so it LOOKS consistent with the rest of your mod even though it will never become available to be researched.
Regardless, though, of how willing you are to make your extraordinary editor available to all modders, TheLopez, regardless of their skill sets -- an amazingly democratic and egalitarian thing to do!! huzzah!! -- this tool is clearly going to unleash the creative juices of many, many gamers! Deepest gratitude from all of us!