Shake to undo always prompts for confirmation to undo the last action. Touching the top of the screen to scroll to the top of the page does not ask for confirm

Shake to undo always prompts for confirmation to undo the last action. Touching the top of the screen to scroll to the top of the page does not ask for confirmation, which is a pain when you are 3/4 of the way through a very long article. Thus, being able to shake to undo the action of auto-scrolling to top of the screen would be a nice solution.