It would be a great thing if it were possible to add notes to the pages which were not rendered on the front end but could be used by creators of knacks to remind what happens on things.
Example
When you have a rule that is firing on a forn, and the page is client facing and you want to be reminded that when the form is submitted it does something that you might not be able to note anywhere else.
It would mean that you could code in the actions into front-end pages without users being able to see them, but which help you as a developer.