Input Remapper seems to work, but my install is pretty darn glitchy...for some reason the sliders "twitch" and when I'm trying to set fan speeds the actual text in the window below don't show it or they flicker also.
I mean it seems to work, but I never know what the speed of the fans are. I mainly go off of audible to determine if it's "about right" or not. Not exactly what I like doing...