Maybe the Russians are on the right track - GAZ-34039K IRBIS (2010)
A system designed at Georgia Institute of Technology enables people with high-level spinal cord injuries to operate a computer and electrically powered wheelchair by moving their tongues. The Tongue Drive, as the system is called, now in prototype, allows a user to wear a dental retainer completely inside the mouth embedded with sensors to control the system (pictured above). The sensors track the location of a tiny magnet attached to the user’s tongue.
Ever heard of a quadski? (Quad - Jetski Combo) - looks like fun :)