Domain mapping emergency - 302 redirect !!

Hi guys !

Playing around with one of my multisite, i noticed that domain mapping use a 302 redirection instead of the 301.

This is a huge issue in terms of SEO, and it is urgent to modify that, or, as in the mu domain mapping, let us choose the type of redirection.

But 302 means that both original url AND mapped domain are visible by google, which means.... DUPLICATE CONTENT

Moreover it means that NONE of backlinks are transfered on the mapped domain !!

Look : http://www.webrankinfo.com/outils/header.php?url=hippocampe.passion-cheval.net&ua=internaute

the original url is 302 redirected to the mapped domain !!!

Please do something !!!!!!!!!

Thanks