default value for submit button doesn't work

buttons use "value" as the array index for the label, not "default_value", therefore the default value action doesnt replace the button label. i've created a custom action to deal with this. here is the code for anyone who is interested:

/**
* Implementation of hook_rules_action_info().
* @ingroup rules
*/
function foo_rules_action_info() {
  return array(
    'foo_forms_action_set_button' => array(
      'label' => t('Set the value of a form button'),
      'arguments' => array(
        'form' => array('type' => 'form', 'label' => t('Form')),
        'element' => array(
          'type' => 'string',
          'label' => t('Form element ID'),
          'description' => t('The element that should be targeted.') .' '. _rules_forms_element_description(),
        ),
        'value' => array(
          'type' => 'string',
          'label' => t('Label'),
          'description' => t('The value that will be used as a button label'),
        ),
      ),
      'module' => 'Rules Forms',
    ),
  );
}

function foo_forms_action_set_button(&$form, $element, $value) {
  $form_element = &_rules_forms_get_element($form, $element);
  if (empty($form_element) || !array_key_exists('#value', $form_element)) {
    return;
  }
  
  $form_element['#value'] = t($value);
}

/**
 * Label callback for set button label action.
 */
function foo_forms_action_set_button_label($settings, $argument_labels) {
  return t("Set the label on button '@element'", array('@element' => $settings['element']));
}