Here in Europe, the debate unsurprisingly is polarised into the "Britten-Norman" camp and the "Pilatus" camp. The Pilatus camp seem to be slowly winning, whilst BNG are holding things off as long as they can.
It's a difficult one isn't it, we all know the safety benefits of a second engine, yet it would be nice to see a regulatory environment that allows a coherent air-taxi service around Europe.
I suspect that when JAA finally permits it, it will probably be tied to a maximum number of pax and some other additional safety requirements. What's probably really needed, is an honest statement of the relative risks to allow pax and aircrew alike to decide if they want to play, but I doubt if that will be forthcoming from any official source.
G