@lmorchard I have a computer mouse (the Logitech G502, it's a "gamer" mouse but I digress) with the capacity to click a button and release the tactile bit of the scrollwheel so I can spin it and it just goes *nyoooom* until bearing friction stops it.
I have found it useful in exactly two places. Being annoying with constant weapon swaps on Counter-Strike, and wildly accelerating exactly this kind of website xD