This will not add variables to settings. Function ajax_command_settings() just creates ajax command, that could be added to commands array. If you want to update settings after view ajax completed you should use something like this:

/**
 * Implements hook_views_ajax_data_alter().
 */
function module_name_tricks_views_ajax_data_alter(&$commands, $view) {
  if ($view->name == 'your_view_name') {
    $setting = module_name_get_settings($view);
    $commands[] = ajax_command_settings($setting, TRUE);
  }
}