Similar to vocab, sentences, kanji and grammar quizzes, is it possible to get some kind of listening sentence/ vocab quiz that is in Japanese and we need to translate it to English?
Is this under development or just difficult to rally multiple Japanese speakers to do? If it isn't too hard, I wish for this feature in some way implemented in the future.
There is not. I do not expect to have it in the future, either, as there is simply too much variation in the language to be able to programmatically check a translation to see if it works. At best, it would have to be a self graded feature where you type in the English, see the answer, then decide yourself if it's correct or not.