Either method works. If the carb linkage is properly adjusted the engine can be killed with the throttle trim on the transmitter, just like a glow engine. Then you simply turn off the ignition switch by hand.

Why is it when people fly glow engines of any size there is no choke servo, optical cut offs, or other extra kill switches but the moment they go to gas there has to be upteen different methods of stopping the engine? Does adjusting the throttle linkage to shut off fuel to the carb limited to glow engines????