I'm entering new cards, and keep the dialog open. Similar words to the one I enter are shown at the bottom, and I can edit these words (double-click). When editing an already existing word this way, it would be good to send the card back to unlearned. Why? If I enter a new word because I can't remember it, I forgot it. The fact that I can't remember now means that it should go to the unlearned batch (it's equivalent to being tested now and failing the recall).
At the moment I have to cancel the entering of new cards, click on the summary batch, choose search, find the word in question, and send it back to the unlearned batch. The functionality is there, but just not very convenient.