okay, thanks. well I've tried it again. command + shift + N or B is a bit cumbersome in the keyboard layout. easy to mess up with other system’s keyboard shortcuts like "command + v".
I still would prefer to use the arrow keys like in the exif metadata view…
a solution, which everybody would make happy, would be user defined keyboard shortcuts.
it would also help in combination to other Digital Asset Management / Photo software.
for example i use almost the same shortcuts in Lightroom and Capture One