[assassingod]

Do something like this:
find:

PHP Code:

if ($noshutdownfunc) { 


above:

PHP Code:

if ($bbuserinfo['posts'] < 20 AND $thread['forumid'] == 4)
{
  eval("standarderror(\"".gettemplate("error_notenouoghposts")."\");");
} 


and create the template that i mentioned above

and for every forum you want to add, place after 4

PHP Code:

OR $bbuserinfo['posts'] == XX AND $thread['forumid'] == XX