This post seems be abandoned for a while…
So users here really want 1-click zoom, which is yet to be implemented. Today I am thinking of the annoying way to pan/scroll when reviewing an image. Even after 6 months I still cannot get used to it, it’s just not intuitive.
I have an idea: in review mode, we can use a long push on the 4 buttons to zoom directly to the corresponding image quarter/quadrant (upper left, upper right…). You can check focus this way on anywhere of the image in <= 3 steps. This is superior because the point you want to check is always on the screen. Of course, whenever focus is in the center of the current crop, just zoom in using wheel.
This is easy to implement in software as well and it doesn’t affect current mapping of the keys.