Allow questions (more than one) to be designated as "alternatives" to a question
This would allow a teacher to quickly find a variation on a question that they have already used. Very useful for re-testing a class who did not get the first question without much explanation. Would also be useful if students could run through a "lecture" a second, third, etc. time, but seeing different questions each time. Would let a self-paced student verify they really know the material now.