There is a feature i've wanted to implement for a long time. You'd be able to just click any of the items in the Dictionary popup while reviewing, to add the vocabulary to the flashcard. Click again to remove it. Dead simple way of customizing cards with your choice of vocab.

So you'd be free, if you want, to pick only words using the On or Kun readings. Or maybe you'd want to pick words based on a textbook you're working with. Of course with the smart dictionary feature I implemented back in October, it's also easy to pick an example word since the words made of known kanji are highlighted.

Along with that there could be a free review mode (non SRS) of a random pick of vocabulary from your flashcards. WHich would be more meaningful than the current "Vocab Shuffle" feature then, as the words are ones you previously bookmarked onto your cards.

Let me know what you think.