I have not made any progress on gaining control over the colors displayed on my Drivetrack.
I have discovered that it seems to be more of a Drivetrack problem, than a Mapwell problem.
When I load maps onto my Astro 430, the different colors are recognized. It is not perfect, but works for what I'm doing.
Funny thing with the Drivetrack, I can upload the same map two different times, and get two different color results. I'm obviously missing some key setting / feature, or whatever with the Drivetrack. I wish I was smarter.