Agreed... Even if your filters aren't parfocal, if you have a computer controlled focuser like robofocus etc, you simply find the focus position offset value of each filter, insert them into MaximDL, tell the computer you want 10x10min lum bin 1x1, 5x5min R G and B binned 2x2, you want dithered guiding and you want it saved "here" with "this" file name... click go and crack a beer... Thats your night in the bag...
Mark said it all... Worth learning and worth the money..