Helisdw - my main issue with the nose-in is the lack of options in the event of pretty much any malfunction but certainly engine failure. You are also poorly placed in your ability to flyaway if hit by a downdraught or a lowering cloudbase. You don't know what is happening in the mountains behind you (deteriorating weather).
An instrument scan that close to the rock face would not be top of my to-do list.
I agree with megan about being easier for the rescued to get in as well.
However your comment ref width of disc laterally compared to forwards is very valid. I'm not saying that it is a bad technique, there are clearly some scenarios where it is appropriate but it wouldn't be my first choice - that would be to have a winch and do it without needing to be in contact with the mountain.
