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Ok sort of get it. I use the dumbo remote also so that's sort of why I figured an on/off switch on remote would turn recievers channels on/off.The 3rd channel operates just like the first 2, its a PWM signal that changes duty cycle based on position of some input device , like the throttle or steering. The 3rd channel on my Dumbo RC transmitter is a switch, either ON or OFF, but that doesn't mean the receiver output is ON or OFF, as mentioned its still a PWM signal, it just goes from 0 to 100% in a single push of the button. If you had an LED hooked directly to the channel you would see the LED ON but not bright when the channel was ON, and the LED would dim slightly when the channel was turned OFF. The RC switch I pointed to has a device on board that decodes the PWM signal and then opens or closes a switch accordingly, just put this switch in series with your load (LEDs) . Not a very good explanation, I'll look for a good You Tube video and post it
One of the dumbo recievers I use for my crawler(which is my only rig with LEDs) has plugs specifically for LEDs so never needed one of those switches.