Haven't posted on here for a while but recently found a good alternative to DSS called Sequator. Sorry if it has been mentioned before.
https://sites.google.com/site/sequatorglobal/home
Stacks images very quickly, can put flats and and darks in and it also removes hot pixels. But the feature I like is that you can mask out land if you're dong wide field shots with a landscape.
Pretty good tutorials on youtube such as this
https://www.youtube.com/watch?v=ql4bEnJc4hE
Cheers