What id anything you'd like to enter into a page was a customizable field (now: extrafield)? Title, description, text... anything.

The user would be able to set if a field is a required input, and where it is required, and where it appears... The whole idea could be organized into modules or plugins.

In Genoa, I can already do some of this by plugins, but I'd like to take one step further: in the future I'd like to make a big plugin that would generate tpls for me based on extrafields in different categories, and also set the "required field" dependencies.