Hello, Ben.
Sorry for taking a long time to respond.
The source code for UscCmd is available in the Pololu USB SDK. By looking at that and reading the Maestro’s User’s Guide you should be able to figure out everything you need to know to control the Maestro over USB. If you have any specific questions about it, I would be glad to help.
We have not released the source code for the Maestro Control Center. Is that what you wanted?
-David