Throttle stagger or lack of it is a function of FADEC equipped engines, never heard of a synchronous function but would be interested to find out.
I thought any damage critical vibration prevention is better than cure e.g vibration trim margins lower, and resonance flutter margins/ranges kept lower, V2500 bus drivers will understand, the engine races through the flutter range when going through the quadrant up to max climb.
Got the heart thumping the first time I did a run on one!!