Hi Michelle, this is something I've been playing with a bit just to better understand accessibility of Canvas quizzes (being pretty new to this LMS as a designer). I may not be understanding the idea proposal correctly, but it seems that this functionality already exists.
For a quiz displaying one question per page: Tabbing through the quiz and just using standard keyboard shortcuts, I've been hitting Enter after selecting an option - that seems to be the easiest way of submitting that answer and moving to the next question.
For a quiz displayed on one page: , You have to tab as normal from one question to the next - hitting Enter doesn't do anything until you hit the end of the quiz (when you tab to the submit button and hit enter). However, you can simply hit the tab key after selecting an answer to move to the next question, which seems to be the same functionality requested in the idea?
Edit: And here's a resource with more detail on keyboard commands, that might be helpful - it makes it much clearer how a user would navigate a quiz: WebAIM: Keyboard Accessibility
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