I'd like to see a user ID feature added into the game. Your user ID would be different then your wizard's name and everybody would have a different user ID. This could be very helpful for a variety of reasons. If multiple players have the same wizard name then you could check their user IDs and be able to tell them apart!
This could also open the possibility of being able to change your wizard's name. When changing your wizard's name your user ID wouldn't be affected. That way people will still be able to recognize you! You could also share your user ID with your friends so it would be easier for them to find you in game!