My ring finger is used for - 1, Q , Z , ~ , Alt-Z , Alt Q and Alt ~
1 - ice lance
Q = Sheep
Alt Q = WotF
Z - arcane explossion max rank (X is rank 1 explossion but i hit it with my middle finger_
Alt - Z = cone of colf rank 1
~ - blink
Alt ~ - cold snap/fireball = depending on the spec
Thats how i use the ring finger , so its not that weak.
But if i cant imagine playng with ESDF - i would break my KB and nerves for sure.