This gist can partially implement a feature sorely needed in Sensei: The ability to indicate correct and incorrect answers, and a way to show feedback for both.
This has been a requested feature for years: http://ideas.woocommerce.com/forums/191508-sensei/suggestions/3582122-show-wrong-answers
By adding some HTML to the feedback, and using this gist, you can show different text when an answer is correct, or incorrect.