Only set the default for parent if not global default (allow other modules to alter)

    $default = ($link['mlid'] ? $link['menu_name'] . ':' . $link['plid'] : variable_get('menu_parent_' . $type, 'main-menu:0'));
    if (isset($form['menu']['link']['parent']['#options'][$default])) {
      $form['menu']['link']['parent']['#default_value'] = $default;
    }