How to access the sid?

I need to access the submission id (sid) in my rule, but it's not included in the $data variable.

Adding the following snippet at line 37 in the webform_rules_client_form_submit function in webform_rules.module works, but surely there's a better way....

  // Add details to $data array.
  foreach ($form_state['values']['details'] as $detail => $value) {
    $data[$detail]['name'] = $detail;
    $data[$detail]['value'] = $value;
  }