Here are a few suggestions for features from another former Circus Ponies user. Some of these have been addressed by others:
1. Have a real zoom for text. Be able to have a 25%, 50%, 100% 150%, 200%, etc. scaleable view of the page. It is hard to read small text for some people, but don't want to have 24 pt. font for copy/paste issues.
2. Have a next and last page icon/key shortcut because when you are in full page view, you have to get out of ti to go to a different notebook page.
3. Make more keyboard friendly. Be able to tab to different fields when not entering text.
4. Allow for flippy triangles to hide/show list sub-items on a note page (like you have for the notebooks). This was a super useful feature in Circus Ponies.
5. Snap to grid feature for placement of objects/text on a page
6. Equation editor (LaTeX)