I think the Vices&Virtues are hardcoded, but correct me on that if I'm wrong.
As for adding names, it should be possible if you use the exactly same syntax as the others use in the names.txt file.
Also it is possible to edit the unit production spreadsheet in a way that allows templars and other order soldiers being produced like any normal unit, you can edit the building prerequisites to your liking. Go look in the Dungeon forum for detailed information please.