The throttle stops on y twin are NOT set. The throttle trim on the transmitter works just like on a single. When an engine quits the othere engine drops to idle as set on the transmitter. I can kill that engine if I want to by bring the idle trim back. I really like this feature as my other (no son board synchro) twin turns into the dead engine and tries to flip over on it's back pretty quickly. luckily I've only had two engine outs so far. One on each bird.
There is a button to to turn off the Safety Synch to start set and adjust.