I would love to see the ability to add custom HTML sections with the option to include dynamic values (from the current record, linked records, or the currently logged-in user) directly within the content.
This feature would be a fantastic way for users with some coding experience to design and customize elements according to their preferences. I believe this could lead to a lot of innovative ideas, especially when combined with the custom CSS options in the settings (or in the block itself), enabling the creation of many unique and interesting layouts.