Filter sites by tags
Some sites are a mesh of the webcomic (or multiple webcomics) but also have lots of other material. For example, I tried adding Star Trek Problems, which is an occasional feature on The Robot's Pajamas, but it added every page on the site from that point on. If there was a way to filter by category or tag it would allow sporadic webcomics like this.
That would also allow you to filter out blog posts for comics like Dork Tower.