For reading or (proofreading), you can take an automated stroll through your document.
Trigger autoscroll by pressing s. This will begin scrolling forward through the document at the default speed.
An indicator at the bottom left will show you the current speed. The speed can be adjusted with the up and down arrows, and Shift-↑/Shift-↓ will speed it up and slow it down in larger increments.
Space will pause and play as you scroll.
Pressing S (Shift-s) while scrolling will reverse the scroll direction.
Press s again (or hit escape) to end autoscroll mode.