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Had we a microphone, you could click the tongue, or even use a sort of Kalaharian speech code. Humming is a idea, too.
There are some cameras for compact flash and or SD card; you could use them to detact face gestures.
You could make a contraption to press the screen using a wacom pen... remember that the wacom does not need to touch the screen, just to be 1cm of the screen when it is pressed.
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