The pink T-Zone button on the T-Mobile Dash/Mail has its function defined in the \Windows\Sort_IE.lnk file which by default contains the line:
I can think of a far more useful way of re-assigning the key to CommManager so I can switch bluetooth on and off for use in my car. So, a simple edit to the file deleting the old line and replacing it with this;
Now I can launch CommManager with the T-Zoes key.