I use a Kensington Orbit trackball, and in order for me to use it, the right button must be set to single-click. (I'm right-handed, but my right arm has a computer-related injury, and I use the trackball with my left hand.) Kensington said in a note to me that they have not decided when to release OSX drivers, since OS X is in beta.
Has anyone been able to figure out how to use this trackball with OS X to allow such adjustments?