I just saw in changelog that Calibre now supports Extra data files for the book. That realy neat, thanks.
I had experimented with this before, but when I saw that Calibre was deleting this kind of little extra, I quickly gave up. It was a pity, because there was a possibility to have cool stuff if it was possible, but after reading a lot on the forums "Calibre Library folder is a Balckbox, don't play inside" I could understand if Calibre was ruthless and I didn't bring up such a minor idea.
But now, is here, Yes
I have just one remark:
Currently, it is not possible to quickly know if a book contains some extra data files through the GUI (you have to either open the folder or do a "Check the library").
So it would be nice to have a small indicator/notification of this, perhaps even their numbers... but maybe it would have too much negative impact on the performance (I tried a trick to get the size of the covers in a CC, it was disastrous). Perhaps by reducing the scope to only the currently selected book, rather than scanning the entire library (as is the case for cover).
An idea.
Thanks again.