I don't see the point of the Camel Archer as an UU at all. As 3Miro said, (I do believe him because I have hardly any knowledge of this) the Arabs came with Horses instead of Camels. And the Cordobans shouldn't get Camels at all (as an UU, they may do as a merc) I thinks it would be better if the Camel archer wouldn't be the art define of the Arabian Horse archer, but a whole new unit which can only be "trained" (I don't know the appropriate word) by hiring it as a merc.
But if we add them, wouldn't it be easier to add the vanilla Arabian Camel archer art?
Yes, I have time to add the new art. My holiday started this weekend. So I have plenty of time for a while. But you'll have to wait until wednesday, because I need to do some things.