I've got my clutch mounted in a pretty crappy position right now, I'd really be interested in a throttle-like clutch. Check out where my clutch is in these pics of my bike: Bike Pics
You can see the clutch best in the 3rd picture.
I think it looks kind of cool, but I'd really love to be able to use both brakes and clutch. Also, the way it is set up now it is hard to use the clutch-lock with one hand! Especially one handed while I'm looking for cars and slowing down at a 4-way in the city.