"Still think you're correct?" only appears when answering type-in questions wrongly.
I've found several places I'd like to submit feedback for other (multiple-choice etc) questions, or the question itself rather than my answers. I'd also like to not have to answer wrongly just to be able to give feedback. There is a feedback tab at the left but that is generic and not related to the visible question, as far as I know.
So... I think there should be a feedback-about-current-question link/button always visible.