Started playing with this and it seems to be working pretty well, with one exception. I want to exclude collections for tags enclosed by brackets . I've tried using [.*] but it fails to exclude those tags (e.g., a tag like [test]). Other exclusions seem to work, but I think it's not recognizing the brackets correctly.
You actually use this as an example in the instructions, although for the general "do not overwrite" collections field, not the individual column exclusion field.