Let admin set defacult action for accessibility tab

Let a site admin change which feature is used (list vs. highlighted view) as the default for the accessibility tab. This would probably require assigning the default via a variable in the menu system and thus require a rebuild if this changes, so there should be a warning in the admin form that if it changes the menus will be rebuilt.

This would also mean you would have /node/%/accessibility - which would be the default, and then one path for both the highlighted and list views.