RE: Smart Fly?
Why type of flying do you do?
The Sport requires a reg if you are going to use lipos with it.
The Equalizer is a waste of money if you spend some time and set your surfaces up properly. He probably used it to match the end points and center on the elevators. However that doesn't give you a proper setup so the surfaces actually move at the same time.
On a 50cc you could eliminate it all by following flatspin's suggestion... An ignition kill is always nice though.