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Many people are used to home DVD players which, apart from the usual play/stop/pause buttons, have fast-forward/fast-backward buttons. MPC has two buttons resembling those, but they do a different thing: change playback speed.
A bakward control would be very useful when watching movies were you sometimes miss something or want to repeat a scene. I guess it's hard to implement, but other players do it somehow.
in the setup dialog, you can bind a key to "jump back ward (large/small/medium)".
Not quite the same, but works well enough.