AMD has already stated they intend to be up to 1.4-1.5 Ghz in the first half of 2001. The problem is that Motorola has no interest in keeping up. What has happened is testament to the power of human ambition. I would like to see a switch of some sort that would temporarily switch the focus of mouse movements to scrolling instead of cursor movement. The switch could be a thumb button or a press upon the whole mouse similar to the full-mouse button on Apple's optical mouse.
People love pushing buttons.
However, it seems to me that the push for a more complex mouse pays too much attention to hardware design, instead of focusing on the problem of input itself, and better software design. Two button mice are a decade overdue on the Macintosh. The scroll wheel is an important addition, however, Richard, you have it right. We can and should do more. Not only is it time for a clear advancement in pointer functionality, it is time for better and more efficient two-handed input.