A thumb stylus for all your gaming needs

The DS already has a little nub for analog control, but what about a thumb based stylus? The Thylus made by the good people at… Thylus Inc. came up with this concept. It looks kind of silly and in a way it has been done before. However, the little pointy thing on the end might make games like Elite Beat Agents easier to play. Or it could be used for games like Jump Ultimate Stars so you don’t have to get the bottom screen dirty with fingerprints. What’s your take useful or useless?