Im wondering this too, I can see the following code in the thread, is that all that needs to be done? it looks like its line 133? My main issue is the data appears to be in the db, but the new users don't show up in the Manager Users list.
And here's the fix... line 129 of save_web_user.processor.php
$rs = $modx->db->insert($f, '[+prefix+]web_user_attributes');
