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More defaults write settings
Although there are many value could be tuned in MPlayerX, I didn't disclose them to the UI, because I couldn't figure out a beautiful way to show them in the Preferences, either I think personally, most user won't care about them that much.

But for some ones, if you are not satisfied by the current MPlayerX. following are what you could change by defaults in Terminal.

name        type        default value        meaning
SpeedStepIncre         float         0.1         when to change the speed in the accessary control(the TextField), the increment value when press ↑↓
SubDelayStepTime         float         0.1         similar with SpeedStepTime, the time in seconds
AudioDelayStepTime         float         0.1         similar with SpeedStepTime, the time in seconds
SubScaleStepValue         float         0.1         similar with SpeedStepTime, it is rational to set this value within 0-1
SeekStepTimeLR         float         10         when use ←→ to forward/backward, the jump time in seconds
SeekStepTimeUB         float         60         when use ↑↓ to forward/backward, the jump time in seconds
VolumeStep         float         10         when use =/- or menu to increase/decrease the volume, the increment value(should be within 0-100)
SnapshotSavePath         string        (internal value)         if you don't want to save the snapshot pics on the desktop, the Full Path of the folder where you want to save it