This choice appears if you purchased any of the Kobold Press things and have the source selected.
It's a bunch of Mechanics stuff that gets turned on to alias Common as the Trade Tongue and Half-elves as Elfmarked. It's all built into the Kobold Press packages that you can't touch as a normal user. Although it would be nice to see what that code looks like so we could do it too.
What Fenris447 is mentioning is that you can add a source in your editor and create menu option files that end in .1st to create a custom option for you to turn on anything that has your source, which can indicate a setting. If you look at the community files that end in .1st in a text editor you can get an idea of how these configure hero options are created.
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