Bugs with hook_send $op='node'

trying the following:

function pw_send_send($op, $module = 'send', $nodetype='', $node=null) {
  switch ($op) {
    case 'node':
      return $node->title;
  }
}

has no effect. i would expect it would allow me to return the text i want displayed, rather than the node body.

i also tried to follow the code in the module, and tried:

function pw_send_send($op, $module = 'send', $nodetype='', $node=null) {
  switch ($op) {
    case 'node':
      pw_send_title($node->title, true);
      return 'pw_send_title';
      break;
  }
}

function pw_send_title($title = '', $set_title = false) {
  static $pw_title;
  if ($set_title) {
    $pw_title = $title;
  }
  return $pw_title;
}

which also had no effect.