Hm? All the Hasselblad 500, etc, SLRs have their shutter release on the lower right as you're holding the camera with the lens pointed towards your subject, exactly the same as the 907x. I cradle the 500CM with the left hand, work the focusing ring (and exposure controls) with the left hand's thumb and forefinger, release the shutter with the right index finger, wind the film/cock the shutter with the right hand.Indeed... unsurprisingly, his biggest criticism!
I think the shift button concept is quite ingenious. As the original Hasselblad 500 concept was right hand focussing / left hand shutter release, this would also mean left hand for the 907X control dial, but right hand to press the shift button?
To me, to use the right hand for both control dial and shift button feels utterly unergonomic. What do you reckon?
Anyway, I'd like a long press of the shift button to be an extra function, e.g. DOF preview! That would make a great deal of sense to me.
Further, it could be a different function depending on whether you are on the main screen or focussing with the preview screen.
With the 907x, I do the same except that with the exposure controls and autofocus, the left hand serves mainly to cradle the camera, where the right hand can also work the focusing ring in manual focus. The right hand also works the control dial and shift button: for instance, in A mode, you adjust aperture with the control dial using the right index finger, EV compensation by holding the shift button with the thumb while turning the control dial with the index finger, and then it's a short move back to the shutter release to release the shutter.
If the shift button could be a toggle, and there was a concept of the short press-long press, then you could do the short press for control dial mode switch and long press for DOF Preview. But with the present setup (shift button only operates the mode change while held down), there is no concept of a long press to work with since how long you need for other operations of shift-control dial are indeterminate. Not a bad idea though.
I reported the lack of functionality of the DoF Preview function on the Control Grip to Hasselblad USA customer service. The tech there tested and found the same on his camera, so a note has been sent off to Hasselblad engineering in Sweden to see if there's something about using this function we don't know or if this is a bug/unimplemented feature. It seems to me assuredly a bug...