I don't know if there's actually a way to do this in the actual version, but it would be cool if you include it in an upgraded one. In the Position Programmer, put two buttons, one for pan inversion and one for tilt inversion, so that when you move the fixtures and assign this effect for the ones you selcted, you can create a symmetrical scene faster than doing it "manually"; the button should apply when adding movement effects as well.
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