variable 'gmap_private_markerfile' is never used.

regarding the following code in gmap_settings_ui.inc, which is shown on /admin/config/services/gmap :

function gmap_admin_settings($form, &$form_state) {
...
if (file_default_scheme() != 'public') {
  $form['initialization']['gmap_private_markerfile'] = array(
      '#type' => 'textfield',
      '#title' => t('Path to gmap_markers.js'),
      '#description' => t('You are using the <em>Private</em> download method. For markers to work properly. you must press the <em>Regenerate</em> button, manually copy js/gmap_markers.js from the files directory to a location accessible by the webserver, and enter the file path relative to the Drupal root (including the filename) in this field. Example: <em>sites/default/misc/gmap_markers.js</em>'),
      '#default_value' => variable_get('gmap_private_markerfile', ''),
    );
  }

a) I use private schema, and my system works fine without this setting. IMO this is a d6-residu.
b) although it uses variable_get('gmap_private_markerfile', '') , I cannot find where it is used again.

Can this be removed altogether, or does it still have a function?