Significant figures in the "Right answer" for the Number type answer
Regarding the statement "The correct answer is: {$a}" for the Number answer type, it may be useful to allow the number of significant digits to be specified for the value of {$a} . Indeed, if the answer is calculated as being equal to for example 2.039023427152, the automatic feedback will be displayed like this "The correct answer is: 2.039023427152", which is probably not desirable. The feedback "The correct answer is: 2.04", for example with three significant figures, is probably more adequate. However, presently this cannot be displayed with the "Right answer" review option.
That is indeed a good point. It would probably be the best to offer some formatting options, even if this adds (again) to the complexity of the edit form. I'll put that on the list of things :)