mpc: add more keybindings and fix original kbd format #940

Job	Run time
check (ubuntu-latest, 26.3, false)	40s
check (ubuntu-latest, 27.2, false)	53s
check (ubuntu-latest, 28.2, false)	1m 6s
check (ubuntu-latest, 29.3, false)	2m 34s
check (macos-latest, 28.2, false)	3m 0s
check (macos-latest, 29.3, false)	3m 49s
check (windows-latest, 26.3, false)	4m 20s
check (windows-latest, 27.2, false)	3m 55s
check (windows-latest, 28.2, false)	2m 25s
check (windows-latest, 29.3, false)	2m 33s
check (ubuntu-latest, snapshot, true)	48s
check (macos-latest, snapshot, true)	3m 13s
	29m 16s

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