I was wondering if there is a method to toggle the "Auto-Brightness" option to the OFF position on iOS devices and if so, what is it?
Brightness can be adjusted when you are inside the app and it is available inside the UIScreen class -
Here's the documentation - http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScreen_Class/Reference/UIScreen.html#//apple_ref/occ/instp/UIScreen/brightness
But Apple's official public APIs do not allow an iOS app to access General settings in the Settings app. So you will not be able to change the toggle button inside the settings app.