Now my question is, did I just do a bad thing, is this going to mess with Admins stuff?
No. Way back in the day, capitals didn't matter and all was right with the world. Then MediaWiki updated their software and capitls were need. So the Forum was modified to automatically make all new registrations into capitals and all was right with the world again. Then phpBB updated their forum software and it broke the "new registrations are automatically capitals" code. And so it goes.
No doubt that when this issue gets resolved, MediaWiki will update again and no longer need capitals. Or it'll require a number, or a minimum number of characters or something. Anyway, we proceed. As a by-product, there are a large number of lower-case usernames floating around with only a few posts that were replaced with proper usernames. So all is good.