Hmmm… you could use this snippet in conjuction with action framework, but not tying into the default “Warn user if page has unsaved changes” set to yes and closing the page or navigating away from the page. At least not with anything documented. It would be a idea to add this functionality though.
Right here under the model option to provide a picklist option with use “Model Id” and “Custom”. Similar to auto table filters on picklists and lookups.
