Some things I do not like.

[Avoidy]

You lost me after using shift and ctrl. That's already too much. I do fine on my SMN. But even there, I feel there are superfluous abilities.

Maybe try a different role besides melee in that case. BLM is fairly complex but it's at least not a lot of actions per minute. MCH might mess with your arthritis during its burst (lots of button presses there), but on the off chance that it doesn't, the actual setup is extremely procedural with no randomness or fluff.
Failing that, consider other roles besides dps. Healing is basically just pressing one button a good chunk of the time. And some tanks like warrior are basically just 123 until you get enough resources from 123ing to use your resource spender.