[Alan @ CIT]

From what perspective? If you wish to add additional "staff" usergroups, edit the following line in the plugin:

PHP Code:

$staff_usergroups = array(5, 6, 7); 


Those numbers represent usergroup ids. In this case, mods, supermods and admins. To add a custom usergroup to the "staff usergroup" list, just add it's usergroup id to that.

If you meant that you wish to make other usergroups only be able to PM staff, then look for the following line (the first line of the plugin):

PHP Code:

if ($vbulletin->userinfo['usergroupid'] == 3) 


Usergroup number 3 is by default the "Users Awaiting Email Confirmation" usergroup. To change this to another usergroup, just change this number to the relevant usergroup id.