I don't think that is a good idea. I suppose that the copper tile represents Samar Island, and the sugar Panay/Negros. Given that, than Luzon isn't so much bigger then Mindanao. (only 1 tile) And Luzon is historically more important than Mindanao. I don't think that Mindanao should be designed for 2 cities. I think it should be designed for 1 city. It is possible to have more, but that shouldn't be favorable. I would compare it to Java. That is designed for having 2 cities, although it possible to have 3. The Philippines will be a colony of Spain in the main mod. I think 3 cities is a bit to much presence for them. Even in my Philippine modcomp, I think 2 cities is the best setup gameplay wise. And if there would be an additional city in the Philippines, I think it should be on Luzon, not Mindanao.