Recently I discovered a new problem: my right thumb gets sore from pushing the shift lever on my mountain bike. I suspect that I am developing arthritis in my thumb (I suspect this since I'm getting arthritis in many points). My question is: Are there shift levers or mtb derailleurs that operate with less pressure? Would an electronic derailleur be a solution? The bike in question is a 2008 Giant Trance X1 with a 3X10 gear setup.