As far as I can tell there is no such plugin but I did however find a solution by asking at the official Vbulletin Site.
Go into the navbar template and replace:
<td class="vbmenu_control"><a href="search.php?$session[sessionurl]do=getnew" accesskey="2">$vbphrase[new_posts_nav]</a></td>
with:
<td class="vbmenu_control"><a href="search.php?$session[sessionurl]do=getnew&exclude=X" accesskey="2">$vbphrase[new_posts_nav]</a></td>
Where X is the forum id.
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