Prior to Mavericks, one could reverse the direction of a Magic Trackpad, using the following defaults commands, and magic five-finger gesture to reorient.
defaults write com.apple.trackpad.orientation TrackpadOrientationMode 1
sudo defaults write com.apple.MultitouchSupport ForceAutoOrientation YES
You can find more information here and here. Unfortunately, this doesn't appear to work in Mavericks. Does anybody know a modern incantation to bring back the old magic?
NOTE: this is not the same as reversing the scroll direction. It completely reverses all input and gestures on trackpad.
UPDATE: I got it to work. Ray Shan's "reboot the trackpad" might be part of the magic. Also, five fingers + hard click seems to be crucial to activate.
Best Answer
sudo defaults write com.apple.MultitouchSupport ForceAutoOrientation YESdid the trick for me on 10.9.5 (required a reboot). I haven't trieddefaults write com.apple.trackpad.orientation TrackpadOrientationMode 1. Possibly the two methods are interacting strangely with each other?