Originally Posted by
Lutris
I don't know whether you prefer range or melee, but i can't give you much advice on casters as I don't generally play them (I have arthritis so we're in a similar place with the need for less button mashing).
I'm having a fair bit of luck with windwalker monk and survival hunter at the moment in that department. Taking the hit combo talent made me more aware of which spells i was using on my monk, which helped me slow down the button pressing substantially in order to maintain the buff, and surv is fairly slow paced due to the cooldown lengths and the need to preserve focus. I would not recommend ret paladins as they are substantially worse now than they were last expac (keysmashing for days). Feral druid is okay, but close enough to rogue that it might give you trouble if rogue did.
I don't know how well any of those would go in organised group content, however, since I'm super casual and only use matchmaking because of my disability flaring up.