Macbook air mousepad multi touch curser movement

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http://ubuntuforums.org – I just installed Ubuntu 13.04 on my macbook air. Everything is working great except for one thing. The touchpad behaves slightly different than what it normally does on the Macbook. In OSX I can move the mouse event though another finger is touching the surface. IE. if one finger is still and another moves, the mouse moves as normal. This is not the case in ubuntu. The mouse stops moving as soon as the second finger touches the touchpad. This is very annoying because part of my palm or left thumb regularly hits it by accident, stopping the mouse-movement. Not a big issue, but if I could get ri (Hardware)