ORIGINAL: bluercpilot
Better still, just use a receiver battery to power your servos when you're doing maintenance / setup. Just unplug the ESC at the receiver and plug in a 4.8v receiver battery. Make sure you don't plug the receiver battery in while the ESC is connected to the receiver.
This has the benefit of avoiding any possibility of inadverent spin-up of the rotors as well as keeping you from having to plug and unplug those important motor connectors.
Even better still, run a short (3" or so) servo extension from the throttle plug on the Rx to the outside and tie it off to the frame. Now it's easy to unplug the motor/ESC and plug in a 4.8V battery for all your adjustments without worrying out getting slapped in the face by the blades or unplugging the motor.