I know that the forum has a small number of registered users, and even a smaller one of active users, but the issue was raised and I feel that, thought small as it may be, it's something that is worth asking. I'm not developing this for myself
Currently, the name is just a display name, it is used for nothing else then to show a friendlier name in the interface, what identifies a user, beyond the ID, is the user's e-mail and password combination.
The poll will run for about 6 more days an I'll update the trac issue with the result.
Rejoice! For very bad things are about to happen.