MongoKitten supports shortcuts pretty well, although they're not advertised for cleanliness. A list of shortcuts is available here:

Global

[⌘ + N] = New Window (macOS only) [⌘ + ,] = Preferences Window (macOS only)

Launch Screen

[⌘ + L] = Connect to Localhost (macOS only)

Entity Detail

[⌘ + E] = Start Editing [⌘ + ⇧ + E] = End Editing [⌘ + S] = Save Changes

Collection

[⌘ + R] = Reload Data [⌘ + F] = Edit Find Query [⌘ + ⇧ + F] = Edit Aggregate Query