To me the ultimate killer feature yet to add to Agenda would be subnotes. Subnotes would not prevent it being able to be viewed as an independent note, but is a subnote in the sense it could be collapsed within a note.
For example, if I had a note like this:
- Project 1
- Project 2
- Project 3
I could double-click on “Project 2”, and see something like a sticky (ideally with choice of default color and changeable) expand inline, allowing me to make additions or edits without leaving my main note. Just collapse when done, and I’m back to my thought process without having to think of navigation at all.