Maybe I'm missing something, but those all sound like things that are display layer and shouldn't be dependent on KFX to be able to accomplish. I do know that that you can run preprocessing on epubs to adjust some of the layouting to your preference. The rest should just be determined by the reader application you are using and any shortfall in customization of those aspects would be addressed by improvements to that application.

Regardless, my point was that: A - most of the books already in the library were likely enjoyed/acquired without knowledge of hypothetical improvements from Amazon rolling out a new ebook format and DRM scheme. And B - even if there is some magic that Amazon had to include in KFX to support the improvements you listed and can't be reproduced without them; I personally would not consider those or most any improvements to be worth losing ownership of books that I purchase. The most valuable part of an ebook is the text and ownership of a copy of that is what I'm paying for. It is fairly easy for me to be principaled on only buying ebooks that I know I can own a copy of due to the diverse distribution that exists for most titles. Even when I had an Oasis, I didn't purchase anything through Amazon and loaded all my books over USB.