I am looking for something that will do the same thing a scroll wheel does on a mouse. But I just want a roller type thing to scroll down webpages (well im going to use it for when i read long PDF files) so i can just sit back and use the scroll wheel to slowly scroll down. I am at the point where i am ready to buy a mouse just to take it apart and take the scroll wheel out. But before i do that does anyone know of anything that will do this without me destroying a mouse? Im sure this is a long shot but hopefully someone has seen one somewhere.