Is there an easy way to give tankers an instruction like "Fly to that colony over there and unload all but 10% of your fuel"? I've been able to get them to automatically choose and fly to a nearby colony when they reach 100% fuel at a gas giant, but when I want to set up a refueling station on some rock somewhere, I have to use the F6-miscellaneous interface to move fuel off the tankers and into the dump. That's doable, but somewhat tedious. Am I overlooking an easier way to do this?