maybe you already thought of that and you decided not to implement it, but I've studied a bit language teaching, and you know, I believe a very important feature toMOTko is lacking now is the chance for the user (=the student) of actually writing him/herself the correct answer for the current card. You might add such test modality, it would be very easy to code, and would improve greatly the effectiveness of the software.
I think you can do that adding an operator in the Actions -> Preferences -> Quiz -> + part, in which you can choose whether just push the box in the quiz window normally as you would do now, affecting the sequence only, or first push a "?" botton, then the box, resulting in the revealing sequence in something like ?(a) meaning the software will actually ask you to input the correct answer. Or anyway a similar solution...
Advantages of such solution: more types of memory would be involved in the process of learning, resulting in a faster grasp of the words, as well as a more conscious/proper use of vocabulary in real-world situations.
Can't wait version 0.12.X with the SuperMemo-2 algorithm!! ;)