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Hi Peter,
That last trick is a clever one to deal with backgrounds.
Another trick but a bit time consuming:
Let's say you have a galaxy and a noisy background.
Make 2 stacks for each of the LRGB:
(1 set ) for the background with everything set to median.
(2nd set ) with everything set to Kappa sigma clipping for the bright areas of the galaxy.
You can then combine the 2 images in layers with Photoshop.
( Put the galaxy on a hide all layer mask & paint it through. )
You'll get a smoother background & sharper details in the brighter galaxy.
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