Or give god-mode or evil a try.

I use god-mode but found that capitalizing letters using the shift key was the biggest cause of pain for me. I retrained my left hand to use the ring finger for shift and added a post-command-hook to turn ",x" into "X", and the problem is largely gone. I also make a point to swap _ and - and also ; and : in certain modes (ahem Python) . My right pinky is still too active (RET and punctuation, but I rarely get any pain, even with a tiny laptop keyboard