How to change the default widget the sidebar

In a similar vein, I'd love to be able to have a separate page/edit form for the non-mercury stuff. In our use case those fields are mainly meta-data related and editors rarely need to change both things at the same time. The sidebar is still useful for things like revision notes/publishing options etc, but everything else could be tucked away on a more traditional edit page.

There is currently no configuration for this. You could potentially alter the dialog data attributes on the local tasks similar to how mercury_editor_menu_local_tasks_alter creates them.

@Sbubaron Mercury Editor currently uses the default node edit form. You could achieve what you're looking for fairly simply by defining a custom form display, configuring it with just the fields you want, then defining a new route that points to that entity form display. See https://www.drupal.org/docs/drupal-apis/routing-system/structure-of-routes →

I am stumped on how to do this via custom code.

I cannot find mercury_editor_menu_local_tasks_alter in the mercury_editor.module file.

If anyone can provide a code snippet, when you have a chance, I will owe you a Drupal beer.