Zoom button works when in Image viewing which is good given my crap photography, however, as far as I can tell it is central zoom only. Old DVD player allows arrow keys to move around within zoomed image / playback. This would be a plus for the BW (reprogram the duration change onto fast forward/fast reverse buttons perhaps)
Central zoom only, on file playback, is also a nuisance when I zoom up SBS such that I can read the subtitles. The subtitles drop off the bottom. Possibly a problem with encoded subtitles, but then, they can appear top or bottom....
Not a big deal. More of a UI issue. There was the simple expectation that the direction keys would provide movement after the zoom button was discovered.