I cant find setting to add an "<all>" option setting at deepest level.

Hi,

at http://wimleers.com/blog/hierarchical-select-2 I red , that there is a Setting to add an "" option at deepest level, but I cant find, how can I setup this. I have enabled the following modules:
Hierarchical Select
Hierarchical Select Flat List
Hierarchical Select Taxonomy
Hierarchical Select Taxonomy Views

My settings for the vocabulary is the following:

$config = array(
  'config_id'       => 'taxonomy-4',
  'save_lineage'    => 1,
  'enforce_deepest' => 0,
  'entity_count'    => 0,
  'require_entity'  => 0,
  'resizable'       => 1,
  'level_labels' => array(
    'status' => 0,
    'labels' => array(
      0 => 'level1',
      1 => 'level2',
      2 => 'level3',
    ),
  ),
  'dropbox' => array(
    'status'    => 1,
    'title'     => 'kivalasztott',
    'limit'     => 0,
    'reset_hs'  => 1,
  ),
  'editability' => array(
    'status' => 0,
    'item_types' => array(
      0 => 'manufacturer',
      1 => 'model',
      2 => 'motor',
    ),
    'allowed_levels' => array(
      0 => 1,
      1 => 1,
      2 => 1,
    ),
    'allow_new_levels' => 0,
    'max_levels'       => 2,
  ),
);

but I havent got option at any level.
I often need select all terms at node/add page. Selecting hundred of terms once by once is very frustrating. If somebody know, how to setup option, please help me. Thanks,

Zoli