I personally wouls like a high eleentalist that focuses on one element. Its more about RPG flair then power and it´s a against the elementalists jack of all trades. So if you are a high tier sPvP player then just comment how powerful you think this would be ;-).
High Elemetalist:
Coose a single element. You can now trait two times the same line (minors don´t double up. Maybe give -10% cooldowns if done).
Instead of elemental swap gain a weapon swap on 5s (4,25 with arcane).
Of course this will trigger the elemental an weapon swap swap each time . Just always the same. (A norma ele could have an average swap aproximate each 3s).
This does not sound too powerful but will be very diffrent. I would even do that as a one way route available after a special story quest. So if you coose to be a fire elementalist it´s fixed.
This will have only half the skills and less swaps all in one element but a powerful focus. Its a nice option with RPG flair.