Regarding the servo: The Maestro's default serial mode is "Uart, detect baud rate" but it can't send servo pulses when it is in that mode if it hasn't detected a baud rate yet. If you were able to use the Maestro Control Center, it would have offered to change the serial mode to "Uart, fixed baud rate" for you. But since you are just using UscCmd, you'll have to change the serial mode by editing your Maestro configuration file and replacing the SerialMode line with this:
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(You will need to load the settings from the Maestro, edit the file, then write the settings back to the Maestro using UscCmd.)
Then after that you should be able to use the "--servo" option to move your servo.
Let me know if you have problems doing this.