Totally, this should be much easier to see in the Editor. There is the world's tiniest almost-transparent green box over one end of the currently selected prereq about 50% of the time that it's selected, so I should totally make this better. This is something that should be more accessible through the main UI rather than requiring the user to manage the database rows themselves.
Improvement_TechYieldChanges is accessible through the
"Add functionality" right click menu on the techs (along with other tech tables that create "starburst unlocks" in CiV). This points out that I should really create a help doc so the Editor can explain some of its functionality, because it's not easy to find this kind of thing the first time!
Technology_Flavors is currently inaccessible except through the conflict detector and that seems like an oversight. It's definitely within the realms of the Editor to want to modify the tech's flavors! I'll add that to the list of pending features!