Copying custom es_systems.cfg to share vs editing original?

[thatguyinfl]

Is it possible to copy a custom es_systems.cfg to my recalbox share vs making the system writable and editing the one in the emulationstation folder?  I have my share on USB and it would be nice to be able to just drop a es_systems.cfg and have it read it, just like we do with the themes. Thank you Luis