Not quite the same thing, but worth mention: http://www.elkarte.net/community/index.php?topic=2258.0
And to set a target="_whateveritis" for redirecting boards, the place if GenericBoards.template.php, let's say, this:
<a href="', $board['href'], '" id="b', $board['id'], '">', $board['name'], '</a>';
should become something like:
<a', $board['is_redirect'] ? ' target="_blank"' : '', ' href="', $board['href'], '" id="b', $board['id'], '">', $board['name'], '</a>';