I also was able to reset some of my Microsoft Wireless Mouse 5000 functions.
With Intelipoint I had the right mouse button showing the Dashboard. I was able to re-establish it using the Mission Control Preference Pane in System Preferences. I set "Show Dashboard" as the F12 key in the first column, and I set Mouse Button 5 in the 2nd column. I also set the right button to Mission Control using Mouse Button 4, also F9. I believe that clicking on the scrollwheel is considered button #3 and I went ahead and set that to the Applications windows, also F10.
I was able to adjust the mouse scrolling and tracking speeds with the Mouse Preference Pane. Not quite as responsive as I remember with Intelipoint, but much improved from what I had right after Intelipoint became disabled.