It’s there already:
| Shortcut | Command | |
|---|---|---|
| ⇧⌘ U | Mark as On the Agenda / Remove from On the Agenda | |
| ⌘ ⏎ | Mark as Done / Undone | |
| ⌥⌘ ⏎ | Mark as Done Completely (also Removes from On the Agenda) |
See also this overview of shortcuts
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