This idea has been developed and deployed to Canvas
Please move the update scores button on quizzes to the top of the page, or put it at the top and the bottom of the page. It's annoying to have to scroll all the way down to the bottom of the quiz to update.
I suggested this before myself, especially to help with the "Q" and now "zap symbol" bug which still exists when you make changes to quizzes (usually just to print it) but don't change the questions. I'm not sure about experimenting with an add on, perhaps Kona Jones should be hired by canvas to make this fix.
I agree that it should be both at the top and the bottom and professors can pick which to click. I just reopened the mid-term for 2 students who had a major emergency. By extending the deadline for them, it was considered a modified quiz, and I had to resubmit the scores for 51 other students. What a pain to scroll down through a 70-question exam form for 50+ students to resubmit all those grades.
I'm not sure what our college's policy on using plug-in enhancements on our work computers for Canvas. I'll ask.
It's considered a browser extension and at least at our school faculty were able to install it themselves (normally they can't install any type of software or anything on their computers). If not, it's definitely worth installing on your personal device!
I feel the issue goes beyond mere placement of the Update button. In SpeedGrader, it is possible to go through several questions and then hit update button once per student. However, if you use grade by question forward arrow to go to the next student, you are at risk of losing your work. I just lost 90 minutes of grading time trying to grade by question by mistakenly assuming that going to the next student was like going to the next question.
I am not certain why Canvas cannot just autosave a score once it has been typed into the SpeedGrader. Canvas does autosave other typed scores, for example, when you add a score directly to the grade book.
A floating Update Score button that follows you would be better than just one at the top or bottom.