To be honest i would prefer to have a 1h weapon with a totem on my back for Elemental or Restoration, something like what Bane currently has. I don't need a shield just give me a god damned huge totem that i can carry on my back!
Logically, why would shaman especially resto and ele use shield? Just askin. I don't think many shaman in lore use shield.
I think allowing us to cast lightning bolt on the move would be a great improvement, other then that I would emphasize the spec more on lightning damage instead of adding fire and earth schools to the pool.
Or they could could completely change the philosophy of an elemental shaman and turn it into a sort of geomancer. Although I would love to see what they would come up with, I'd hate losing chain lightning though. :/
A mace and a shield? I don't know, but it has to be something with a shield, I suppose. Can't think of any memorable or "legendary" shield or weapon for shamans besides the Doomhammer, but that one goes to the Enh, maybe the legenary mace of Ulduar?
I wish I had the image of Squidward where he says "Something stupid, im sure"