Scrolling and Autoscrolling for Adobe Digital Editions
These options can allow for a smoother reading experience. Also, a good chunk of the population has neck and shoulder issues, and autoscrolling allows one to read without constantly having one arm curled forward on the mouse or keyboard.
As told by you over mail that you want to raise an issue for Adobe Digital Editions and not Reader, you can raise your query on https://community.adobe.com/ for Adobe Digital Edition under “Digital Editions”.
I hope this will help you.