Looks like there are Keybindings for Tabpage (of secondary objects) navigation (like “Change tabpage to the tabpage to the right”) and actions in the Tabpage toolbars.
Action/Function
Microsoft Windows
Mac OS
KDE/GNOME
Change tabpage to the tabpage to the left
Alt+← (Left arrow)
Ctrl+⌥ Opt+← (Left arrow)
Alt+← (Left arrow)
Change tabpage to the tabpage to the right
Alt+→ (Right arrow)
Ctlr+⌥ Opt+→ (Right arrow)
Alt+→ (Right arrow)
But offhand, I don’t see some for Record selection navigation within the secondary object lists.
Yes, you can use one of the access key shortcuts these are the underlined letters that I see on windows (may vary by operating system ) when I press and hold the ALT key and then the letter/number that underlined to go to that field or run that command.
So on the Person editor window to go the bottom half using the keyboard only I normally press the ALT key and then press the letter “e” twice to go to the “Events” tab ( unfortunately you have to press “e” twice because for some reason the “Gender” field is mapped to “e” also!