I filed a support question with Elementor and they said it was outside their control and would require custom coding. I've tried several role manager plugins (Capability Manager Enhanced, User Role Editor, and WP User Manager),but none of them seem to pick up the Elementor capabilities. They do pick up Formidable Forms capabilities just fine, so I think it's something in the connection between Elementor and WordPress--which means that probably no one will take responsibility for it.
Does anyone know a way to allow users to move content blocks and insert Elementor templates/blocks without giving them the capability to delete or modify existing Elementor templates?