[Beanamir of Gondor]

See, the only problem I would have with this is that it smells distinctly of fanfic. That's not to say that I don't enjoy fanfic every once in a while: oh no, quite the contrary. But reading yaoi CharlesxSydney or an account of how Jay Gatsby really didn't get shot is a LOT different than reading A Tale of Two Cities or The Great Gatsby. Fanfic is not really very respectable, and it is always, always, always different than the author's original work.
Ahem. Anyway, that's my English-major view on it. While I might enjoy reading it for fun, it would never really be Tolkien, and therefore I just wouldn't see it as part of the Middlearth narrative.