this needs an easy way to speed up and slow down, like a hovering (no click) control on part of page.. or maybe control speed from the keyboard: right forward l

this needs an easy way to speed up and slow down, like a hovering (no click) control on part of page.. or maybe control speed from the keyboard: right forward left backward up faster down slower arrows.. said control can slow text to stop, then speeds backwards.. bidirectional speed control on the fly is what this needs