[BirdOPrey5]

Yeah I played with this some more and I got it working (I think.) I only tested it for a couple minutes because I didn't want to lock out my users.

Make new plugin on global_start hook:

global $vbulletin;

if ((THIS_SCRIPT == 'showthread' OR THIS_SCRIPT == 'forumdisplay') AND defined('IN_FRNR') && defined('FR_UTILS_INCLUDED') && (!is_member_of($vbulletin->userinfo, 5, 6, 7))) 
{
  fr_standard_error("You must log in below to view the site. Only users with valid subscriptions may use this app.");
}

When a user first gets to your forum in forumrunner they will see a message they need to login (the message in red above). They will be allowed to login.

What this plugin blocks is viewing of forums or threads.

Also customize the usergroups (in blue) above- 5, 6, 7 are mods, admins, and super-mods- adjust them to your needs.