Thanks all so far. I'm beginning to get a picture.
Bose-x: Try it in a seneca........ Having not flown one, presumably the thing just falls out of the sky. In fact it makes me wonder about all the more powerful, heavier GA types which usually recommend a "trickle" of power just prior to landing. Surely we need that trickle of power to keep open the margin of safety for regular non-scary landings.
For the lighter GA types at "Radio" stations with an empty circuit. Then I guess the answer is "by all means".