Add 'value' property for action/ condition

I'm missing a 'value' property that will allow me to silently pass a value.
My use case is taxonomy integration and the use of 'base' property. I'd like my form to know which vocab has been chosen.
Notice the use of 'value' => $vocabulary->vid,:

/**
 * Implementation of hook_rules_action_info().
 */
function taxonomy_rules_action_info() {
   $info = array();
  // Get existing taxonomy vocabulries.
  $vocabularies = taxonomy_get_vocabularies();
  foreach ($vocabularies as $vocabulary) {
  	$info['rules_action_taxonomy_assign_term_to_content_'. $vocabulary->vid] = array(
  	  'label' => t('Assign a term from vocabulary "') . $vocabulary->name . t('" to content'),
      'arguments' => array(
        'node' => array(
          'type' => 'node', 
          'label' => t('Content which term will assigned to')),    
        ),
      'base' => 'rules_action_taxonomy_assign_term_to_content',
      'value' => $vocabulary->vid,
      'description' => t('Assign a certain taxonomy term to the content.'),        
      'module' => 'Taxonomy',
    );
  }
  return $info;
}