I toke a computer course and using Mac machine for studying. There are hard to operate the Mac mouse. Both mouse are compactable after my testing. Therefore it is improvement easily.  

I drew the Schematic, please reading. The wheel of scroll direction is different between Win and Mac machine but just exchange 2 pin only. Adding switch for selecting Win/Mac easily too.

I also improved the left button of mouse. It is reduced the cost for factory but the result is not sensitive. I adding the electronic component is NPN 9013 transistor and resistor 100 ohm. There are amp circuit to increase the sensitivity.