So what's the problem? A person can artificially boost their download numbers if they choose? If that's the case, you could just make the download numbers only viewable by the author(s). After that, it can be improved by allowing the author to modify the download number at will.
Sorry for changing status. My first time reporting an issue here and it apparently does that if I don't select anything. I leave it to you to choose whether my request is worthy of status change or not.