[Mediawiki-l] Problems creating User Groups (Bump)

I am having problems setting up custom User Groups.

I have added a new User Group to LocalSettings.php. The new user group shows up on Special:Userrights and i can assign it to a user. However, after i have assigned a user to this new custom group, the new privileges don't become active for that user.

Is there anything else besides: $wgGroupPermissions['ninja']['delete'] = true; that needs to be added to LocalSettings to enable a new user group?

(I am bit confused by the documentation at http://meta.wikimedia.org/ wiki/Help:User_levels At one point it says you need sheel acccess to the server to create new groups, and then a few lines down it says that new groups can be added in LocalSettings.php as i mentioned above.)

thanks