Allow teachers to have more control of the 5 in a row idea.

Excellent idea. Due to the nature of the topic (and the creativity needed for some of the clever exercise sets) different levels of performance are appropriate. Teachers know what is most appropriate for their own students. This is certainly a case where one size fits all doesn't work.

It would be nice to allow teachers either the ability to set a percentage or control the number correct in a row.  The post above talked about it being to many at times, but sometimes it allows students to pass with only 1 or 2.  I know this is because of other Khancepts they have already passed, but I also use Khan to go back and review from prior knowledge and only passing 1 or 2 is not enough practice for what I'm looking for from my students.