Though I have not tried it, there are not many Protocols with more than 7 buttons... but according to the 8D Scroll Mouse, you can map 4 buttons to "stick" or scroll wheel.
Quote:
ScrollMouse, also known as GyroMouse, has a "stick" similar to IBM ScrollPoint. The stick movement is recognized as the Z axis motion. You can push the stick to right and left, as well as forward and backward. Give four numbers to ZAxisMapping option to map movement along all these four directions to button actions.
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It may only work under the "IMPS/2" protocol. It is supposed to work with the serial and PS/2 port on supporting OSes.
It would be done simliar to normal, but the zaxismapping would be something like "4 5 6 7" rather than just "4 5".