When I press "preset", it works, but the option disappears and I get "---" again in the menu box. Perhaps you can keep the name until I change a color. Also, h

When I press "preset", it works, but the option disappears and I get "---" again in the menu box. Perhaps you can keep the name until I change a color. Also, how expensive is to calculate the plate immediately, instead of waiting until the user press "Generate"?