[kh99]

You could - I haven't tested it but this might work.

if ($threads = $vbulletin->db->query_first("SELECT COUNT(*) AS threads FROM " . TABLE_PREFIX . "thread WHERE postuserid = $post[userid] AND visible=1"))
{
    $post['threads'] = $threads['threads'];
    $post['replys'] = $post['posts'] - $threads['threads'];
}

But this adds one db query per displayed post. It would be better to do something like add a threads column to the user table and manage the value the same way the user post count is managed, but of course that would be more complicated.