Misadventures of SLOTH

Finally, Opera has autoscroll. Using this script, you can select from several scrolling speeds, and start and stop the autoscroll. The controls are nested in the bottom right corner of the page. Press the hide button to hide the entire controls. You must then reload the page to make it reappear. I removed the ability to double-click on the page to activate autoscroll, since that interferes with text selection and hotclick menu.

If you're interested in the script, download from here:
autoscroller.js