On the stream when you said you played around with the idea of having RMB be your 2 weapon skill, could that maybe one day be a toggle (between Target/Dodge/Skill 2) if having full keybind options causes problems?
I only ask because the 5 skills would fit perfectly as
LMB 1 – RMB 2 – Scroll up 3 – Scroll down 4 – MMB 5
then i could bind shift to dodge instead of shift plus keys, and bind tab to target to have my dream keybinds =P