Just be careful if you expect the enhance shammy to keep agro. IIRC, the dual wield talent still reduces threat as well. No way around that issue (other then don't DW, but then you lose out on a lot!). I had sorta the same issue for my boomkin shammy group; the talent that increases range for druids also reduces threat :-/ Since my boomkin tanks, it's not helpful. I suppose if you have the talents to spare, you could take the threat reducing talents for the elemental shaman, and make sure you rotate windshock into your mix.

Or, just take the cast time pushback talent and let the things beat on your elemental shaman (make sure s/he has the best gear and shield) and you shouldn't have much problems.