This was done a few years ago in a different way: you wear an electronic collar which eavesdrops on the nerves running to your vocal chords. These signals are then decoded into words. Finally, some words, like "forward", are interpreted as intentions to move. The system is called the Audeo.

Official site: http://www.theaudeo.com/
Video: http://www.youtube.com/watch?v=iyQv61899HE
Article: http://zone.ni.com/devzone/cda/tut/p/id/6130

This reminds me...

Several years ago we got our first dog, an Alaskan Malemute. They're bred to pull sleds, so I decided to "walk" her while wearing my roller blades. The results were exhilarating. The only way for me to stop once she got up to speed was to let go of the leash, fall down, or wait for her to stop/turn. Cats coming into view proved very dangerous.

Who needs roller coasters when you've got a dog and skates?