The only use for them on Ely would be if you intend on killing turoths or kurasks with ranged, which I doubt many people do. But like Kyle has already mentioned, they are a unlock in the slayer shop. They would only be used on Ely to slay said monsters, which already have a way better way to be killed.
With that being said, I have nothing against having it as an option, but like Lation said, is it worth the dev time?