I have one of those geeky programmable keyboard running opensource firmware called QMK which allow all sorts of fancy keys.
So to avoid windows and other software jacking my media key. I use F13 - F24 instead since they're unlikely hard-coded to anything on any system or software.
Problem is foobar don't know what key they are... They work perfectly fine though. Just not as pretty-looking as other key.
Would love to see a tweak in the future. :)