Not trying to discount the rest of your comment, as it is definitely a good read, I just wanted to ask if you've ever considered a gaming-mouse for this game? I have a logitech G600, and pretty much the only thing my left hand does is control movement and a couple of random keybinds - everything else is bound onto the mouse buttons :)
MMO mice can be quite challenging to get used to (I regretted my purchase for about 3 weeks until I finally got comfortable with it), but I couldn't do without it now. May help you out with your range issues.
