I was told the decision to stop the prop with the Nanchang was also based on a few other things, one being a low wing and having full fuel in tanks etc for safety. The pilot in command is an air force training captain with thousands of hours in the 'Changs' , he was extremely cool calm and collected on the radio to the tower, even after ATC told him he was cleared to land, all emergency crew were stationed, he replied "Wilco, Looking forward too it"! then without drama put the aircraft down on the Rwy, stopping exactly where he said he would stop at the second taxi way.
He clearly knew what he was doing as far as shut down procedures go with the aircraft and his skill in landing that aircraft with a gusting 22kt xwind was more than impressive. Whether it was right or wrong, I dont know, as I don't fly the 'Changs' and don't have a POH emergency info on them, think I will just stick to the Yak, at least the gear never retracts fully LOL.
I was told that they switch the mags off to get the prop it a correct position then shut down the prop, fuel etc same as in emergency procedures for full engine failure. everything except the master. Once the decision to land is made and committed, then I see no harm in doing it to save the aircraft from more damage, whether I owned it or not.
I am also guess if the prop isn't spinning and slamming into the ground, that is one less thing to replace, or worse worry about it disengaging that massive prop from that big radial engine and killing someone.
Just my two bobs worth