I'm smelling an awful lot of "no" coming off this RPG. Perhaps I'd be better suited to Omashu, where King Bumi lets people "open their mind to the possibilities". I present the quote I was given by [@McHaggis]:

[Quote] It is implied that most, if not all, earthbenders are capable of bending sand, but because of the loose shifty nature of sand [i]it is not an easy transition for the average earthbender[/I]. The sandbenders of the desert are especially proficient with it due to their particular habitat.[/quote]

It's not outside the realm of possibility an earthbender not of from the desert may turn out to have some ability in the fine control of sand over the brute force control of rock. But to save the GM and Co-GM the trouble, and since I see no reason my concept is being disallowed after several steps back, I'll say that I'm most likely out of this RPG.