Heat (Score 1)

One cheap lo-tech tip: see to that your arms are warm. No kidding. I live in a cold country, and realized that my RSI started to flare up during summer (!). Turned out that was when I dropped the warm sweaters in favor of t-shirts. Long-sleeved shirts/t-shirts was the solution for me, that put me below the threshold. (I also went for left-hand operation of the mouse and an ergonomic keyboard) Good luck!