I believe you can upload files on there. I think I've seen one author do that. But yes, it's mostly for reviews/tracking. There are additional features you could utilize, like giveaways (though they charge for them now which sucks) and forums.
They are typically pretty fast. I've reported a couple books to be merged before and they get on it quick.
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As an aside, you can do a lot with your book/author pages. Add quotes, video files, trivia/quizzes, and start forum-esque discussions. So while you can just post your book and leave, it might be worth considering to add some flair.