The Desk shortcuts

Press ? in the Desk to open the dialog. The list below is read from the same table the Desk uses, so it can't drift.

Desk shortcuts
Keys	What it does	The visible control
`J`	Next request	Click the next row in the queue
`K`	Previous request	Click the previous row in the queue
`E`	Resolve the open request	Resolve button above the conversation
`N`	Add an internal note	Internal note tab by the reply box
`?`	Show this list	Shortcuts link in the queue sidebar

Key caps. KbKbd shows the shortcut inside the button or menu row it triggers.
aria-keyshortcuts. Set on the control so assistive tech hears the key.
Shortcuts dialog. Opened by ?; lists each key beside its on-screen control and carries the off switch. Escape closes it and returns focus.
Profile switch. People can turn single-key shortcuts off. ? still opens the dialog.

When to use

Add a single-key shortcut only for an action done many times a shift.
Every shortcut also has a visible control, and every header action is in the command palette.
No shortcut for a destructive action.
Shortcuts never fire while typing in a field, and never with a modifier held.

DoShow the key on the control and set aria-keyshortcuts.

Don'tGive a destructive action a single key. One slip deletes work.

Single-character shortcuts must be turnable off or remappable (WCAG 2.1.4); the profile switch does that.
The dialog traps focus, closes on Escape and returns focus to what opened it.
Each shortcut has a pointer-and-keyboard alternative, so nothing depends on remembering a key.
Key caps use text, not images, and keep 4.5:1 contrast.