Could you please consider adding GTIN/MPN and Brand fields as standard on product pages? Google and FB require this info to be included in XML feeds for advertised products and so at the moment we're having to create custom fields to capture this info. That's easy enough but then external plugins we frequently use don't see custom fields unless you purchase the pro version and some of those still don't see custom fields so it would make life a whole lot easier for us, and may others I'm sure, if these fields were readily available in the product data section and could just be populated when loading rpdoucts and then easily included in xml feeds or easily visible for other plugins.