Hello, Marcus.
It should be possible to send serial commands from a python program to tell the Maestro to stop sending signals to individual servos. This post details a couple ways you might try turning off a servo to avoid damaging it. Please note that not all servos will turn off when you stop sending them a signal. More information about this can be found in the “Servo control interface in detail” post on our “Engage Your Brain” blog. If your servos continue to hold their position when no longer receiving a signal, you might try adding an external circuit to control the servo power rails, as Jon suggests in that post.
-Brandon