Helikopter Service had engineers cleared for rotors running ground runs on their S61's. Not sure about their policy on other types. As far as I am aware without incident.
I remember that there was a minimum fuel weight required, other requirements I know not.
A number of years ago I was conducting a tail rotor balance on an Enstrom being run by an engineer, he shoved in the wrong pedal and I was gratefull for the companies brown overalls as the tail came my way at speed!!!!!!!!!!
I have only seen ground resonance on two aircraft, strangely both with skids. One being a Lama and the other a 365C.
The Lama was probably due to uneven ground and the 365C defective undercarriage dampers.