Thanks quiris for this really useful app! It's great to be able to have both proper hyphenation (not supported by the "old" MOBI format alone) AND the nice book covers!
One question, seeing that this is a python script, and that many people with jailbroken kindles have python installed on their kindle, could this script be run directly on those kindles without having to tether them to a PC? That would be useful to people who mainly use "send to kindle", and who otherwise have no other reason to connect their kindle to a PC.
Maybe it could be set up as a KUAL extension, would that be technically possible?