I was lucky enough to mention my interest in getting a vertical mouse around a coworker who had one laying around unused. So, I've been rolling with that for a while, and it has relieved my pinky of tingling. yay!
But my thumb started complaining about the frequent counterforce required to oppose the index finger on clicks, esp on click and drag.
I hadn't been using my wireless touchpad for a darn thing... so, I got the inspiration to set it on the floor and click with my foot! This has been brilliant so far.