The latest version of UE MAN allows the administrators to set a username form. This feature will help in standardising how your users login to your website. Its beocming more and more common that users are unable to remember their usernames due to the lose rules around username policies.
In UE Man an administrator can force the users to use a specific username format, for example first.last name or email addresses only as a username. An administrator could also alternatively enforce a prefix or domain for all users.
Normally with Joomla, you need to specify a username, email address and passwords for registration. We've found that users will always forget their username. Reducing the potential pain points helps create a better user experience for both site administrators and registered users of the website.