mpc: add more keybindings and fix original kbd format #939

Job	Run time
check (ubuntu-latest, 26.3, false)	39s
check (ubuntu-latest, 27.2, false)	55s
check (ubuntu-latest, 28.2, false)	1m 5s
check (ubuntu-latest, 29.3, false)	1m 14s
check (macos-latest, 28.2, false)	2m 41s
check (macos-latest, 29.3, false)	2m 46s
check (windows-latest, 26.3, false)	2m 35s
check (windows-latest, 27.2, false)	3m 1s
check (windows-latest, 28.2, false)	2m 23s
check (windows-latest, 29.3, false)	3m 10s
check (ubuntu-latest, snapshot, true)	46s
check (macos-latest, snapshot, true)	2m 34s
	23m 49s

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