The trackman that I use is left-right symmetric and comes with 2 big + 2 small buttons. I usually set one of the small buttons as the wheel emulation button in xorg.conf, and can then scroll vertically or horizontally. Annoys me way too much that I can't do that in OSX and have to settle for pageup/pagedown for the 2 small buttons. I also usually set the other small button as physical middle button.
I used to need xmodmap with older versions of xorg and xfree86 but basic settings only need xorg.conf now. Xmodmap is only needed for very specific actions or scripts now(ie. volume control).
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