This might be a bit premature, but would be handy to get some feedback. All of the actions should be non-destructive (ie they create and work on copies of the current layer only).
I use the threshold crop one to trim off alignment/stacking rubbish around the outside of images first thing after bringing into PS from Nebulosity. Tried to include a dialogue box to explain usage.
Big stretch and small stretch are just some curve adjustments to bring out some detail. I use big stretch typically first, maybe a couple of times, then small stretch sometimes helps but often don't and just use manual curves. Feedback on better curves appreciated.
Remove stars does still leave some artifacts that need cloning out manually. I'm working on a methodology of getting rid of those. Still not happy at this stage.
Star selection is probably a misnomer. Just put a duplicate of the original image with stars on top of your starless image, making sure there isn't any visible layers between them. Run the action and you can blink the stars/no stars versions by turning that top layer off.
Feedback appreciated.
Troy's Astro Actions v0.9.1