Using different comment system?

Actually, it turns out to be really easy to do that.

The Disqus plugin works by adding a filter like so:

add_filter('comments_template', 'dsq_comments_template');

So you hook into something before the comments_template like the_content and remove that filter but only for a specific post or page ID (IDs are unique). So if you wanted to use Disqus for everything but disable it for page ID 123 it’s just

add_filter( 'the_content' , 'mh_disable_disqus' );
function mh_disable_disqus( $content ) {
   $id = get_the_ID();
   if( $id == 123 ) {
      remove_filter('comments_template', 'dsq_comments_template');
   }
   return $content;
}

You can use other tests instead of the ID such as has_tag( 'No Disqus' ) to handle Disqus commenting or not.

Sorry, I’m more of a PHP noob, how would I hook into that?

See that line that has add_filter? That hooks into the WordPress loop when the post or page content is being processed via the_content filter.

There are lots of places to do that hook, I just picked it because the_content get’s displayed before the comment_template. It’s a good place to remove any filters or functions that effect the comment section for that post or page.

You can put that code in your theme’s functions.php file or create it as a plugin like so.

http://pastebin.com/67raZpim

Copy that text into wp-content/plugins/selectively-disable-disqus.php and activate it in your dashboard.

Using it as a plugin is safer. If something goes wrong, just delete the plugin file.

You will need to know what the ID of the page or post that you want to exclude Disqus comments from is. It’s probably not 123. 😉