Create a way for learners to stop the timer in the timed sessions

I really like the timed sessions, and they've been really useful to me. However, it would be really helpful if there was any way to exit the session and stop the timer without having to complete all the questions. I started a timed session without realizing it, and I went to do something else before realizing the clock was going, and I had to rush to complete the problems, making me miss a few, and drop levels on mastered subjects. I knew how to do the problems, but the rundown of the clock never let me do them. It would be so helpful if the timed sessions could have a "Save Progress and Exit" option, or at least be able to stop the session and redo it with no effect on your skill levels.

Thanks!