You can specify content type with field type in your content. For example static pages can be set as type page which are excluded from recent posts and all posts page. You can use site params mainSections and disableDisqusTypes to control which page types are excluded from recent posts and Disqus comments respectively.
This is some static page where you can write about yourself.
You can disable Disqus from contents selectively or for all contents with certain content type. Use content field disqus to disable Disqus from certain contents.
title: "Content without comments"
This is a content without Disqus comments.
You can also disable Disqus for certain content types by using site param disableDisqusTypes. You can check config section above for example.