Hmm here is a workaround that might work... Having a field in the user table and have it sync with the profilefield one. You'd just have to change $post['field5'] to $post['newfieldname']. An easy synch would be something like
PHP Code:
if ($bbuserinfo[field5] != $bbuserinfo[newfieldname])
{
$updatefields = $DB_site->query("
UPDATE user
SET newfieldname='$bbuserinfo[field5]'
WHERE userid=$bbuserinfo[userid]
");
}
in the phpinclude template.