I understand that you can adjust the amount of organic materials on the planet. But i think it should add something to the planet when I changed it.
For instance, vegetations should appear on the surface of the planet when I crank up the amount of organic materials to the planet (around 0.00015% maybe). And depending on the atmospheric compositions, it should change colors.
If there's ocean on the planet, there would be lush rainforests near the equator, with deserts forming on the mid latitude. Since thunderstorms would form on such planet, and it would only form near the equator, as you might expect.