nigelh
I must be missing something here .....if you had worries about the throttle you would definitely not sit in a hover waiting . I also see no reason to do an auto . Surely a fairly fast approach and then bleed speed off for a run on would be the simplest as if the engine quit at any time you could continue your flare and auto the last bit . I personally would never shut down a running engine unless i absolutely had to .
I had a throttle stuck fully wide open in the cruise on an Enstrom, I decided I did not want to blow my engine up as rpms would increase every time I reduced pitch for an approach, so I chose to pull the fuel shut off valve and auto her down.