@Hilbert90 Or perhaps people just don’t want WaniKani wasting time on features they think would be useless? For the record, I’m not against the suggested change. But I think it’s solving the wrong problem. I don’t think any other SRS flashcard program has the proposed feature either. But they don’t need it because they have a way to undo typos and mistaken entry like this (at least Anki, iKnow, and Kitsun support this). Really WaniKani should just get over their weirdness about not supporting an undo button and give people more flexibility.
@SparklingLimeade If you’re looking for something to help while this feature doesn’t exist, try the Double Check script. It won’t catch your errors ahead of time, but it will let you undo them after the fact. It also has built in (via its settings) a delay so that you can’t accidentally press Enter too fast and move to the next question after a typo.