[staktrace]

If you need to allow identification of users, you'll probably want some sort of username. And adding a username later will be harder than putting one in now. Also, any deviation from what the users expect/are accustomed to (i.e. username/password) will lead to user confusion. I would just go with the standard username/password login.

Personally I don't mind if you generate a random password for me, but either way works.

[homonculus]

There would be a username, it just wouldn't be a part of the login process. I'm inclined to go with a better system instead of what people are expecting, but that's probably bad policy if I want users :) . A randomly generated password might solve the duplicates problem, but I guess I'll just stick to the standard format. Thanks for the feedback.