It would be nice to have built in keyboard short cuts for hyperstacks. So as well as the current < > next/previous slice, next previous channel and frame would be useful

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This functionality was added in version 1.42l:

Added keyboard shortcuts for hyperstacks: 
> - next channel 
< - previous channel 
ctrl+> - next slice 
ctrl+< - previous slice 
alt+> - next frame 
alt+< - previous frame