I've got an idea for a plugin which I think would be very useful to everyone.
When a book doesn't have a cover in the online databases (random current books, old books, freely available books...), we have the possibility to generate one based on the metadata. Would it not be possible to write a plugin that would give you the ability to extract the first page of the book file and convert it as an image to be used as the cover in one click?
I know one commercial ebook library software does it from PDFs (though I can't remember which) and it was one of the few assets that made me hesitate between Calibre and that software.
I hope someone with the knowledge required to do this will find this idea useful and code it (even if only for select file types).
Have a nice day all.