This might be a lot to ask, or it could be very easy to implement depending on how the app was created. I was wondering if a new mode could be added for compound word study. Nothing major — imagine that after pressing the "Study" button, you have the classic single-kanji study option, plus a second option for compound words.
This second option would work just like the first one, but instead of a single character slot, there would be multiple slots for a specific word. For example, if the question is "警察":