如何讓X31小紅點的中鍵支援捲軸功能？

剛剛在TPUSER看到TzanJan大大發表的文章裡面提到，只要把X滑鼠的設定檔改為以下即可：

Identifier "Mouse1"
Option "CorePointer"
Driver "mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "true"
Option "EmulateWheel" "yes"
Option "EmulateWheelButton" "2"
Option "ZAxisMapping" "4 5"