Oh, hm, I'm pretty sure that in older versions the persistent file was not actually generated until the Nameless choice occurred, so deleting it was the way to revert to the prior state. I guess that's not the case anymore, or I misunderstood what was causing it to be generated. It's possible that this caused issues with loading saves that should have had a persistent value but couldn't find it. So yeah, I suppose now if you don't have the old version and want to change it, you actually have to uninstall completely and reinstall?