Is there a way to automate event feedback using Civi and Drupal webform?
We could create an option to disable the unregistering from events as this also solves the problem that if multivalue widgets are enabled for multiple sets of event fieldset, they do not work together well. This way we can get a better control towards the behaviour, also makes the solution possible for any widget.

Regarding the loading event form URL, I think it will also be good to become a checkbox under "Event Registration Options" as people might not want to allow users to change some event setups through URL freely.