Would it be possible to get a cycle view key for the preview window? Preferably with a variant near the NumPad - I believe that Insert is free?
Right now, if editing large sets and looking for the 1 photo it is pretty convenient to use the 2 up mode, however the shortcuts for 1 up, 2 up vertical and 2 up horizontal are 3 separate keys, which aren't near to each other or common hand placements for clusters. It would be better to add a key which cycles (toggles) between these view modes (meaning you're only ever max 2 key strokes away) - this avoids adding 3 keys to any programmable peripherals to solve the issue as well.
I don't quite understand why the shortcuts aren't all customisable, but I assume that is to do with the programming and has been asked many many times previously!
Thanks for your consideration!
-Mike