Number repeat events
I'm afraid there is no code that I know off. It's certainly possible we can add an id (or date or something) to the Event listing in the admin-config page. End-user org can become an official Webform CiviCRM sponsor as of $300; send me a direct message if you're interested in learning more. 

I would also be happy to review a PR if you (and/or your developer) would like to submit one - I'm a co-maintainer on https://www.drupal.org/project/webform_civicrm