Next up on our list of things to do is to revamp the extra study modes by showing an intermediate modal dialog where one can filter what is being studied. With that in place, it will be possible to filter to only the characters if desired before launching the study session.
I don’t think we will be able to get to (2) for a while due to the current pile of work we have. However, it does give us a useful idea on what we could do to help users reinforce the mnemonic story, which I think we can definitely improve on!