This could be a solution for people that want to atune to a single element.
- First they should allow ellementalists and engineers to add a 2nd weaponset, but only to be switched outside of combat. (its a neccessarity to make this spell work)
Now they should add an elite or utillity spelll (depending on asumed power of the spell) that allows people to stay in a single atunement. Allowing access to the 2nd weaponset as all other classes have, and turning the F1 to F4 skills in elemental specific skills. You can stay in this atunement as long as you want
By pushing the skill a 2nd time you go back to normal mode and there will start a 3 minutes recast counter, to prevent people from switching with this mode between elements to easilly.
This way people could choose to become a true watermage, or a fire elementalist, without to much unballancing. You will be just as powerfull in a single mode as when having all 4 atunements available, but this way you can build better for a single role and have 2 weapons that work at differnent ranges.