[Admin]

1. In forumdisplay.php replace:

if (!isset($sortfield)) {
  $sortfield = "";
}

with:

if (!isset($sortfield)) {
  if ($forumid==xxx)
    $sortfield = 'title';
  else
    $sortfield = '';
}

change xxx to the ID of the Archive forum.

2. Go to Forum Permissions and set for each usergroup in the Archive forum that "Can Rate threads if thread rating is enabled in the forum?" is NO.

3. I'm not in the mood, this is the worst kind of hacking.