I propose making the building and managing of Lightning Shield charges into a more important mechanic to the Elemental spec. There would be a new Blizzard UI underneath the character portrait similar to Boomkin's Eclipse meter and Pallies' Holy Power that would help us keep track of charges.
Earthquake would become a baseline ability for all Shaman. It would be replaced by this:
Eye of the Storm: 1/1
When you have 7 or more Lightning Shield charges, you may cast Lightning Bolt and Chain Lightning while moving. For every Lightning Shield charge you have above 3, you take 5% less damage. Stacks up to 6 times.
The first part of this talent would greatly help Ele in both PvE and PvP, which suffers the most of any ranged class when forced to move.
The second part would be a much needed defensive boost for PvP, replacing Astral Shift which was lost in 4.0.1.
It would add another layer of complexity to the class, creating a choice between burst damage via Fulmination and mobility + durability.
It would not be overpowered due to how quickly charges can be removed in PvP.
Another change would be to Thunderstorm, allowing it to grant 6 charges of Lightning Shield in addition to its current effects. This new utility would allow Shamans to immediately throw up a +30% defensive shield and become able to move while still maintaining some dps or immediately cast Fulmination every 45 (35 glyphed) seconds.
A new graphic for Rolling Thunder and Fulmination would also be nice. I'd like to see electricity begin to arc as charges are built, up to the point where at 9 charges, you can barely see the Shaman behind a cloud of lightning. Fulmination should strike the target with a thunderbolt from the sky.
In conclusion, this new mechanic adds to the flavor of Elemental, which should be based around "charging up" and then releasing that energy. It would greatly increase Elemental's pvp durability and counteract problems with PvE mobility – the final step in our evolution from being a glass turret.