I think the only time you should use two fingers is if your bike is suited for it. For instance, its a lot easier to use two fingers on a sport bike with dual front brakes than it is a big cruiser with a single disk in the front.
Sport Riding Techniques by Nick Ienatsch which, despite the implications of the title, has a LOT of good information about riding on the street, recommends using two/three fingers for the clutch and brake. If your clutch is light enough and your brakes powerful enough (so you don't need to put that much effort into braking) then using two/three fingers is fine.
Quote:
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Use two fingers, the index and middle fingers, on the front brake lever. The old days of fading brakes pinching your fingers against the bar are long gone, and a wholehand grab is not only too much pressure for today's low-effort systems, but it also reduces your control of the throttle when blipping (revving) the engine on downshifts.
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Now, granted, the GZ's brake system probably isn't considered "low-effort," so you probably wouldn't want to use this technique on this bike.