#472 An option to Save extra mplayer options into presets.

[Teerawi]

In my case i frequently output front and center audio channels(or stereo tracks) to the back channel where i plug in the headset, and it's very annoying to keep copy/paste mplayer commands from external text file when i need to do this or when revert back to normal.
This is only one example.
So i would appreciate if you can add an option to save these extra commands and load them when needed with a couple of clicks(or single click) instead of the long way.