whoward69
DLL Minion
So it seems that Technology_ORPrereqTechs is partially implemented but not supported.
Tech OR prereqs function perfectly (ie they are fully supported in the game core DLL), it's just the UI that has no idea how to display them.
But there are other mods that use tech OR prereqs, so you could hunt one of those out and see if you can pull the tech tree UI changes from it/them