There isn't anything that will do that, but hopefully this helps.
In scp/tickets.php ~ line 81 AFTER
if(isset($_POST) && $_POST)
$ticket->setStatus($_POST);
ADD
if(isset($_POST) && $_POST=="Close")
$ticket->postNote("Ticket Closed","Ticket closed by ".$thisuser->getName());
In scp/tickets.php ~ line 180 CHANGE
if($ticket->close()){
$msg='Ticket status set to CLOSED';
TO
if($ticket->close()){
if($ticket->postNote("Ticket Closed","Ticket closed by ".$thisuser->getName()))
$msg='Ticket status set to CLOSED';
In scp/tickets.php ~ line 291 CHANGE
if($t && @$t->close()) $i++;
TO
if($t && @$t->close() && $t->postNote("Ticket Closed","Ticket closed by ".$thisuser->getName())) $i++;