In case anyone comes here looking I made an applescript that does the job. You could automate this using automator so use a simple keyboard shortcut to activate it for easy access.
Script:
tell application "System Preferences"
activate
set current pane to pane "com.apple.preference.universalaccess"
end tell
tell application "System Events"
tell application process "System Preferences"
tell table 1 of scroll area 1 of window "Accessibility"
delay 0.2
select (row 10)
end tell
clickbutton 5 of window 1
delay 0.1
if value of checkbox 1 of sheet 1 of window "Accessibility" is 1 then
click checkbox 1 of sheet 1 of window "Accessibility"
else
click checkbox 1 of sheet 1 of window "Accessibility"
end if
click button 1 of sheet 1 of window "Accessibility"
end tell
end tell
tell application "System Preferences"
quit
end tell
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To do the automator method all you have to do is launch it and select "Service" Then set "service receives selected" to "no input". Search in the action bar for "Run Applescript". Paste the script code there and save. Now in System Preferences> Keyboard> shortcuts there should be a catagory called General. Under that should be whatever you named your automator service. Make sure its checked and then just click and add a keyboard shortcut!
Hope someone finds it useful. I made this for my brother because he hates having scroll on for games as well.