[Beck]

Well you could use the map editor to create a galaxy in which only one or more planets produced organics by reducing the percentage of organics for each planet to zero. However each homeworld would produce organics as each start with percentages based on the Start game and not the percentages as indicated in the map editor. Further there would be an increase once research was advanced enough to allow resource converters and facilities that allow the increasing of the percentages of each of the resources but it would make organics a premium resouce.