Control for Child Theme when using the Builder

Will it be possible to lock-down a child theme and the options available for editing?

For instance, what if you wanted just a few page templates and on each template page you only wanted certain elements to be editable. My idea here is that I could create a comic-book looking theme and have an image upload and text area. I wouldn't want any additional elements added. Just the ability to change text and upload an image. Each page template would have a different page layout to build a story. All editable from the frontend. Add a new page and pick a layout. Then fill in the pieces I allow to be edited.