I've received feedback from a couple of students who are provided with some starter code in a CodeRunner question (we're on v3.2), either to build on or fix. They are clearly enjoying the question type (so thanks very much for designing it :-) ), but have suggested that a Reset button would be very useful.
They would like to be able to revert the 'workspace' area to as it was originally, before they started tinkering. The 'Reset' button would need to have a confirmation message to ensure no accidental resets:
"This will reset the question to how it was originally. Are you sure you want to continue?
In their case, I assume that they've started editing the starter code, significantly messed up (or the cat has walked over the keyboard), and then found it more difficult to complete the task.
Hope that's useful feedback.