In Oz, we have Civil Aviation Advisory Publications which provide guidelines for variable and reserve fuel. 20 min fixed reserve for VFR and 30 minutes for IFR. Advisory only.
However the Civil Aviation Regulations state that the Pilot In Command shall simply ensure there is sufficient Fuel and Oil for the flight.
So if he lands with the engine still running, as far as my understanding goes in Oz he is not liable for any prosecution legally.
Personally, I'd rather be scratching my head in a field somewhere and not the least bit concerned about repercussions rather than have the noise stop even if it was on short final to an airfield.
And it gives you stories to tell the grandkids too....