[CyberRanger]

It would be possible but you'd need to tweak some vb code. If you are running a *nix type server (like Linux), there is an option under vbulletin options -> Server Settings and Optimization Options called *NIX Server Load Limit.

Once you set this, it is evaluated in global.php around line 811.

PHP Code:

// check to see if server is too busy. this is checked at the end of session.php
if ($servertoobusy AND !($vbulletin->userinfo['permissions']['adminpermissions'] & $vbulletin->bf_ugp_adminpermissions['cancontrolpanel']) AND THIS_SCRIPT != 'login')
{
        $vbulletin->options['useforumjump'] = 0;
        eval(standard_error(fetch_error('toobusy')));
} 


You could change the if condition to allow the groups you want.