I hope you understand this post was meant to educate on the challenges
FYI you succeeded. I can definitely appreciate how much you've done and how much you have to deal with in regards to the editor and moreso now.
I think the biggest issues with the quote and code boxes have already been stated. Copying and pasting quotes is a big one for me...I don't understand why it doesn't work. In RTE mode everything in this box is HTML. Whenever I copy some html table and paste it into the editor it still displays the table (and obviously breaks down when the post is submitted) so why isn't it displaying the quote box? Other than that though I think you know what we want.
With that said, there will definitely be improvements to the code and quote functions to address concerns such as multi-quoting, split quotes, etc.