Pulse, at least, is only for books downloaded from Kobo themselves. Remember, they have to keep a database of stats and comments for every single book they have - and likely for every single edition of each book. Keeping track of peoples' sideloads, with the near infinite variety of filenames (or MD5 or equivalent signatures) and author + title combos (since lots of people and sites set the metadata differently), would probably be too much to ask. Odds are that it would force their database to at least triple in size, probably more.
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