The usual dampers supplied with "Regular" servos are in the shape of 4 grommets and eyelets.
Your suggestion solves the problem of vibrations due to the engine movements from side to side, and there are also vibrations caused by combustion. These are smoothed out by those grommets, and care should be taken of the servo housing not to touch any element of the structure. I am looking for a method of installing this particular servo with some kind of isolation from the structure.
Thank you for your idea which sounds very logical.
In my other F3A model I use the HITEC Mighty Micro HS-85MG servo for throttle. It comes with 2 grommets, though, but is not HV and not S-BUS2 compatible.
Thanks again for your idea, I am going to implement it.