I am a quadrapeligic with only the ability to use my right arm and my fingers are bent with paralysis so I'm wondering how user friendly the mouse is on macbooks. Can you control the mouse easily without having it do erratic things? How is the sensitivity level? Can you use it without having to apply a lot of pressure with your fingers and can you set the mouse for your preference level? You see, I am use to using a touchpad on my Dell and click the left or right mouse button to do what I want with a computer. Also, does the Mac OS have features to make settings for the disabled as Windows does? Is there such a thing as sticky keys feature on the Mac OS like there is in Windows' Control Panel under "Accessibility"?