This is really two feature requests that are different but related.

First, it would be great to have a simple checkbox that would allow me to exclude a particular newsletter from the auto-generated Archive list.

Second, I'd like to be able to embed a single newsletter issue as a post, page, or project via shortcode. (Being able to embed a newsletter by shortcode would also solve the issue of being able to comment on a newsletter, as the newsletter could be embedded in a post with comments enabled).