[Xenon]

as said create a new custom profile field just allowing yes/no as option, and afterwards open functions_forumlist.php

find:

PHP Code:

if (THIS_SCRIPT == 'index' AND $forum['subforumcolumns'] != 1 AND ($subsonly OR $depth < MAXFORUMDEPTH)) 


and change into

PHP Code:

if ($bbuserinfo['fieldxx'] == 'yes' AND THIS_SCRIPT == 'index' AND $forum['subforumcolumns'] != 1 AND ($subsonly OR $depth < MAXFORUMDEPTH)) 


replace the xx with the fieldid of your new custom field

that's all