I don't have a throttle hold swithc as I am still using the stock radio. and my reasoning for it is just for the ooh wow factor of remote power up, and yeah you would have to have another source of power to the reciever but the stock reciever has a battery hook up, and then only the servos would have power, not the motor as it runs of the ESC that wouldn't have power until you hit the switch. so it wouldn't be possible to spin up without hitting the switch. and even then you can't hit the switch until the power is on to the transmitter, which you could do from a distance. if there is something I am missing that makes me wrong here tell me, but the throttle hold switch still has power going through thte esc straight to the motor. so it would still be safer thatn throttle hold.