I'm trying to understand how effective keyboard shortcuts are in canvas, both for those using screen-readers and for those using shortcuts because of a physical impairment. I'm baffled by the lack of access to shortcuts within module pages (nothing happens when I hit the comma key or 'shift+?')? I feel sure I must be missing something. Can users navigate headings within a page using shortcuts? Can they user the 'previous' and 'next' functionality using shortcuts? If I'm right about this, what are the work-around for those not using a mouse? It'd be great to get some clarity on this, thanks.