pan with RMB instead of MMB? I've got a bunch of Logitech MX mouses (mice?) which work great for most applications. However for some reason pressing MMB to pan and rotate, causes Blender to zoom in even when I'm not scrolling the wheel. Really annoying.

I'd like to use the RMB or LMB as the rotate / pan selector. So MMB becomes only zoom in / out. 

Is this possible? I'm looking through Input but not seeing a remap for MMB -> RMB or LMB.
You're rightly looking in File > User Preferences > Input - it is indeed there, just obscured:



Just set Rotate View and Move View as you like.