With 4.0 we may have an near unplayable level of skill bloat. At least game-pad users will suffer.

Why not have a Fire Rotation, a Ice Rotation and a Lightning rotation instead of adding 5-6 more buttons to your one single rotation.
Then have certain mobs resistant to certain elements so a clever BLM has to use the correct element for good damage.

Melee can have rotation build on blunt, piercing, slashing damage.