Database: Player Count

I am using nointro and redump files and retroarch has mapped almost all ROMs correctly. The issue is that Player Count seems to know only Playstation and some Wii games.

How can the database be edited to show player count for Genesis, NES, SNES, Master System, 32X and Dreamcast?

Sorry to bump this, but if anyone could explain to me how I can do this, I would be willing to do the work so that everybody can benefit from a more complete database.