Disable for posts but enable for pages?

Yes that is possible. You’ll need to add a line of code to the active theme’s functions.php file, or in a customization plugin:

remove_post_type_support( 'post', 'wpcom-markdown' );

We have added this but it hasn’t achieved the desired effect. In face the opposit. It’s now enabled for posts and disabled for pages?

Any update on this? the code has been added to root and child theme functions still with no effect