I made a request on vb.com to allow email address as the login (easy to remember) and then usernames can be set to something else, e.g. a full name and title "His Right Hon. Ronald D. Fitzgerald-Frazer, Sheriff of Lower-Saxony" without THAT having to be the log-in.
They are considering it. Let's hope 4.0.3 get's the feature. Vote the thread up, or add a positive comment, to increase its chances of getting implemented.
http://www.vbulletin.com/forum/showt...vs.-login-name)