Surely Syncho-sound is great, but that is mostly sound effect in general.
I would think it is more critical that one has independent gyroscopes for each of the two rudders;
to react instantly there, on board, not to wait for a control input from the ground;
that might help lot more in trouble with one of the engines. Such gyros are pretty
cheap, just less than 50 USD and do not need any programming; just to be
placed between the Radio and the servo. Isn't it ?

Cheers,
Nick