Some wishes for Kindle books

I love reading Kindle books but wish it would support these things:

• An app for book signings. A strength of print books is the ability to get the author's autograph, turning the book into a keepsake. How can Kindle readers, for example, be used at book signings to attract people to meet the author?
• Marginalia. Notes and highlights are powerful, but it would be nice to be able to do marginalia as well. I use OneNote for marginalia, but I'm sure readers would want to have the marginalia in the book itself.
• Highlight continuation automatically. My Paperwhite flips to the next page to let me continue a highlight. The PC and Cloud readers don't. I have to fiddle with font size to get the section I want highlighted on the same page.
• View multiple pages. My particular quirk is I like to stretch a word processing document across a wide monitor so I can view 4 or more pages at a time. I feel like it makes it easier to jump back and forth between pages to follow a narrative or argument. I find it very useful when I'm grading papers. I'd love for my ebook reader to do the same because I like to be able to quickly jump back to a previous page to refresh my memory or jump forward to pick up on the book's organization. 

OneNote has been a great productivity tool, but...

I thoroughly enjoy OneNote for personal productivity. It's amazingly powerful. For example, if you paste the URL of a YouTube video to a OneNote page, it will automatically insert the video on that page so you can watch it on that page.

However, one feature I'd like to see on OneNote is the ability to assign a page to multiple sections at the same time and, when I update that page, its copy is updated in all those sections. Someone might say I can tag the page, but tagging in OneNote seems more suited to specific items within a page so you don't lose track of them.