it would be very very useful to be able to have two instances of calibre (or the 64 and 32 bit versions) open at the same time when adding books. So often a duplicate is shown BUT there is no way to know the quality of the book.
It would be very useful if the finding of a duplicate, while listing name, author and filename would also include a custom column such as quality so you would have a better idea of whether to add the books or not.
It is too bad it is not possible to open a second instance in a read only mode for when adding books.
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