I did the changes now, however I had not yet the chance to test them on my Kindle. In emulation mode everything runs well. Hm, not everything: Latest integration of rotation detection broke the emulation in file choser mode.
As for djvu: I'll look into that, but that will take some time. It's a complete new API... I can't promise if it will ever be ready, let's just cross fingers that I'll be lucky and have some free days and it's raining outside :-)