The addition of a configuration option to determine whether random questions are selected from one category only or from sub-categories is most welcome.
With the current implementation one must click the edit icon for a random question to determine the selection criterion. Ideally there would be an indicator that is visible when one views the quiz questions on the edit quiz page. Currently the process of checking the selection status of a random question is too laborious.
Add icon that indicates the selection status - Potential downside needs 2 new icons as I can't think of any current icons that would be satisfactory.
Where the questions are selected from one category only, append the word "only" after the category name.