Thanks for your answer
That clears things up a bit for me. After two coasters that made me believe that Discjuggler doesn't support overburning Bin2Boot converted Images, I managed to get Rainbow Cotton selfbooting the Echelon-way with CD-Record. I added the option "-ignsize" when burning the second session, but I don't know if it's necessary.
Nevertheless, I noticed that the speech in the intro and other sequenzes seems to be out of sync. Quite irretating.
Think I'll burn it at least once non-booting on a usual CD-R to see if it shows the same there...