I tried switching on the Burst with camera key option yesterday, since I thought it might be useful to have that enabled.
And having done so, I found it *impossible* to shoot just 1 photo. I tried many, many times and always got 2, even with the shortest button press.
This is surely a bug, right? I mean there's no camera I know of where you have to get at least 2 photos when continuous (burst) shooting is enabled. The on-screen shutter button doesn't behave this way either: short press = 1 photo; long press = burst of photos. NOT short press = 2 photos!