[Mysticales]

Had a thought, If you use this method from the template edit. (Speaking in 3.5x edits.)
2. Go to 'Style Manager' and in the 'Navbar' template:
Find:
<!-- / nav buttons bar -->
Then if you use THIS instead of whats there now...
Add Below:

<if condition="is_member_of($bbuserinfo, X)">
<else />
$menucontrol
</if>

Replace "X" with your usergroup ID you want to show it, that may work too, Thoughts? I mean it should be good for users who want just 1 usergroup like a "Premium" paid susbscription or a special usergroup to gain access to it. Which on THAT navbar, maybe use it for your special groups content. In theory it should work, Im gonna try later.