UPDATE:
On the Third Party Mouse Software front......
Since Windows 7-64bit is loading it's own mouse driver.
I decided to try using Microsoft's Intell'Mouse software just to see if it has fine tuning of the Cursor Speed and Acceleration.
Sadly no, it doesn't
This is really starting to tick me off.
I can't believe that there is no one out there,
{other than Kensington} putting out third party software for Windows 7 64bit.
Because many of the new trackballs I've been looking at, are very similar to my old model #64215 Kensington.
Signed: Ensign Tzap