Quiz

Single answer is very helpful as new default.  Thanks.  However, we must eventually provide some kind of a greyscale/color bar feedback to indicate that no answers are ever black and white--all are varying shades of grey. 

3)  I always use unlimited attempts for quizzes.  My goal is for everyone to reach 100%.  On the few times I do a test, I set it for one attempt.

4)  I prefer highest score for my purposes (as in 3).  But I can see if you are doing a TOEFL test simulation, you would want stricter approaches.

5)  "Show feedback" is no problem as default.  If it is there, it is shown.  If none provided, nothing is shown.   (Shame on you, Tim, for not always putting it in      Shame on me  as well