Configure preferred source for controlling only favorite player

[MurzNN]

When system use multiple media players, Media Controller Compact Plasmoid use only one source for control, seems from which it got last event.

So very often this is web browser, that plays some short media file, that is not good, because after playing in browser I can't control my favorite media player.

Will be good to have option for force use preferred source to control in widget settings, can you please add this feature?