I originally inquired about this because I was using a CPT with over 200 posts. You currently have “Global” settings for Sidebar Layout and Footer Widgets in the Customizer “Layout” area.
Could you add in a future version of GP, “Global” settings for the Disable Elements in the Customizer “Layout” area? That way, the bulk of the settings could be preset and on a post by post basis it could be overridden.
Great idea – the only trouble with that is the options in the pages are set to disable those elements, which would make it tough to have options to enable them if the global setting was set to disable.