Is there a Quick switch for trackpad mouse pointer MBA 10.9.1
To assign the script to a keyboard shortcut, you can assign it an Automator Service.

Open Automator.app and choose Service, and set the "Recieves text" at the top to no input.

Drag in the "Run AppleScript" action from the Library. You can find it by searching for applescript on the left side of the window. 

Replace what the action already contains with the script below.

Save, then go to System Preferences &gt; Keyboard &gt; Keyboard Shortcuts &gt; Services to add the shortcut keys you want (click add shortcut on the right).



This is the script:


property largeCursorSize : 2.0 --1x to 4x size
tell application "System Preferences" to reveal anchor "Seeing_Display" of pane id "com.apple.preference.universalaccess"
tell application "System Events"
    set theSlider to slider "Cursor Size:" of group 1 of window 1 of application process "System Preferences"
    if value of theSlider is 1.0 then
        set value of theSlider to largeCursorSize
    else
        set value of theSlider to 1.0
    end if
end tell