Yes, that does sound far more complex than I'd imagined it would be! - But I'm sure it will be well received. Changing the colours can affect the whole look and mood of the aquarium so much.... And having user change Registry files is perhaps not the ideal way to do it!
BTW, Jean, (my wife), recalls having an eyelid cyst a few years back. It too was treated by using just hot compresses, (as-hot-as-possible, is what she was told). - It eventually cleared up without any other treatment.