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I have used a Logitech Trackman Wheel for the past 10 years. Though the first version had an issue with the middle mouse button similar to what you explain, recent versions are fine. When I dis-assembled my first one it used a linkage to press the switch for the wheel, while the other buttons pushed directly on the switches. If you can still find one I would recommend the USB Trackman Wheel <u>http://www.logitech.com/en-ca/429/166?WT.z_sp=Image</u> Once you get used to the thumb control you won't go back to a mouse - I switched because of carpal tunnel syndrome.
Chris Trummer