[ChrisXX]

So let me get this straight, if I just change this...

    if ($vbulletin->userinfo = $vbulletin->db->query_first("SELECT userid, usergroupid, membergroupids, username, password, salt FROM " . TABLE_PREFIX . "user WHERE username = '" . $vbulletin->db->escape_string(htmlspecialchars_uni($username)) . "'"))

to this...

    if ($vbulletin->userinfo = $vbulletin->db->query_first("SELECT userid, usergroupid, membergroupids, username, password, salt FROM " . TABLE_PREFIX . "user WHERE email = '" . $vbulletin->db->escape_string(htmlspecialchars_uni($username)) . "'"))

It will force users to login with their email address, instead of their username?

My goal is to make the username benign, and only for display purposes. The reason is I will be integrating VB in with some other apps that require email, and also use a username but only for display purposes.

Am I correct?

My second question then becomes, if two users have the same display name (for vB, username), will it cause problems? If so, is there a way to rectify that?

Thanks much in advance!