I see "Custom" allowing you to choose which elements (frame, fonts, etc.) to allow/block for the domain you're configuring.
But it doesn't offer the ability to say "apply these settings to the domain example.com only when I'm visiting example.com, and not when I'm visiting anotherexample.com which happens to load JS from example.com".
But it doesn't offer the ability to say "apply these settings to the domain example.com only when I'm visiting example.com, and not when I'm visiting anotherexample.com which happens to load JS from example.com".