Simple, but effective

While it’s relatively easy to add open-source, standards-based Hypothesis annotation to any website by adding just a line of code, this plugin makes it even easier and enables some basic configuration controls such as limiting annotation to just post or page types, excluding annotation on the home page, blog page, or specific posts/pages, highlights on by default, sidebar open by default, etc.

I agree it would be nice if the plugin supported custom content types beyond WP’s standard pages and posts.