There seems to be a surprising amount of consensus about this. People are happy with all the proposed changes except 9, which almost everyone thinks is bad.
Actually, 9. is something is added to my forum post at the last minutes, not one of the changes that I have been thinking about for a while, so I am not so surprised it turned out to be a bad idea.
Because there seems to be consensus, I created MDL-46090 to track this work. (I also added a couple of related accessibility issues there, because they seemed relevant and I might fix them at the same time.)
To answer some of the questions raised:
6. Phil: issue with qtype_opaque not working with show all on one page. I don't think we can let this hold back improvements to the quiz. Instead, we need to fix qtype_opaque. (I wonder how hard that is?)
7. Joshua: difficultly of navigating to review of other attempts, in quizzes with multiple attempts and not immediate review. I am not sure how much of an issue this is. Maybe make inter-attempt links available to all users, not just teachers?
7. Dawn: getting rid of back to info link at the end of review is bad. Maybe, but on balance I would still rather remove it. Once I have coded up the change, we can see how it looks before the change is actually added to Moodle.
7. Tim Lowe: Only show Re-attempt quiz button if that is possible: of course.
8. Joshua: back to course link on quiz info page, does that go against the Moodle standard? Yes, that is my concern, so I am still unsure, but quite a lot of people have asked for it over the years.
I hope that is everything.