For example, if we're out somewhere, my wife will sometimes want to take a shot with the *istD, but if I happen to be using an M lens on it, then I have to either change it, or show her how to use the GBK. And if its someone in my family or something, then no chance of them doing it right :) I suppose it could be considered a feature that it limits other people wanting to take my camera off me, but mostly it seems an inconvenience, admittedly not a major one.
Love, Light and Peace, - Peter Loveday Director of Development, eyeon Software