[Mediawiki-l] User Groups

[a@kid]

I am having problems setting up custom User Groups.

I have added the new User Group to LocalSettings.php (as shown on  
http://meta.wikimedia.org/wiki/Help:User_levels), and the new user  
group shows up on Special:Userrights. However, after i have assigned  
a user to this new custom group now of the new privileges are  
actually 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?

thanks