Organize keyboard shortcut actions by mode (note editing or not).
Currently, all keyboard shortcuts are displayed in a single two-column table: Action and Shortcut.
However, there are two distinct types of action: Those available in Note entry mode and those available in "normal" or "navigate" mode. (If this isn't the case, then I have discovered multiple keyboard navigation bugs, e.g., selection via shift-up/down works differently in note entry mode than it does in navigate mode.)
It would be beneficial to group keyboard navigation into note entry and "just navigate" modes. Having overloaded shortcuts should be quite acceptable (shortcuts that do one thing whilst navigating, another whilst entering/editing notes).
For example, simple up/down arrow could take me up/down a staff, allowing me to change the instrument I am navigating. When in note entry mode, simple up/down would raise/lower the pitch of the current note.
(As I think about this, perhaps up/down would be more useful for selecting the note in navigate mode, e.g., when working with piano clusters, switch to note entry and up/down becomes pitch up/down, etc. Ctrl-up/down could be used for switching staves in navigate mode and for raising/lowering by an octave in note entry mode, etc.)