Several of my students have complained that the quiz ended and they had no idea they were even close to being out of time!

In a real classroom setting, I would remind the students when they are near end of time and should start wrapping up their work. It would be nice to have the option for the quiz to "beep" when there is 1 minute (or X minutes) left in the quiz.

This would also be helpful since the visible quiz timer seems to stick to the top of the page for some students, so when working on later questions in the quiz the time remaining is not salient.