I can't remember what Sylvain said to do ( in the original version) to change the panels, but I do know I set the White panel as standard for all the choices, because it looked like too much hassle to change it "manually" every time.
Not sure what to fiddle with next - might be best to just copy/edit a tmd for each combination, but if option.tmc is as good as they say, it should be possible to write one that covers all bases.
Anyway I deserve a beer after all that, so I will look further tomorrow