remove children tab, remove the module fieldset in nodes

you've got a great module, although for D6 i had to use the latest dev version to get things working.

I would like to remove the children tab and Node Hierarchy fieldset in nodes view and edit... how can i accomplish that?
It would be really easy if you'd add an option to remove those from display.

(I'm not sure it should be in the topic but i tried theming over the children tab but didn't work with this code:

/*
* Remove tabs.
*/
function phptemplate_menu_local_task($link, $active = FALSE) {
  if ($link['title'] == 'Children') {
    return '';
  }   
  else {
      return '<li '. ($active ? 'class="active" ' : '') .'>'. $link ."</li>\n";
  }
}

any ideas why it doesnt work?)