I don't have enough disk space to keep ISO files around, but before deleting them I always burn the ISO, md5sum and torrent to a DVD. I'd like to do my bit by seeding back up, but I can't get Ktorrent to seed from the DVD drive. It insists that I specify a "download" folder and it has to be writable media. Is there a way to make it use the files on the DVD?

This is not yet supported in the 2.1 series, from 2.2 onwards it will be.