One thing that would be very useful would be an option to add a Quick Links widget on the right-hand side. This would give visual separation from the left nav, which is more centered on things that can be opened/accomplished within Canvas. The Quick Links would instead be for created links to external sites that are useful to students.
Ideally, there would be an option for a teacher to choose widgets that appear on that right side. I could choose to turn off To-Do List and turn on Quick Links. Or if someone prefers, they could choose to show both.