As it is happens quite often that the rich editor of WordPress is a barrier concerning posts including difficult HTML, I wrote a Plugin. I am planning to release an improved version to the WordPress Plugin repository soon, but I think this works quite well for now:

// Deactivate Visual Editor if option is set
add_action('pre_get_posts', 'deactivate_visual_editor');

function deactivate_visual_editor() {
  global $wp_rich_edit;
  $post_id = $_GET['post'];
  
  $value = get_post_meta($post_id, 'deactivate_visual_editor', true);
  if($value == 1)
    $wp_rich_edit = false;
}


// create a box for each post / page
function cis_init(){
	add_meta_box("cis_post_settings", __("Details",TEXTDOMAIN), "cis_post_settings", "page", "normal", "high");
	add_meta_box("cis_post_settings", __("Details",TEXTDOMAIN), "cis_post_settings", "post", "normal", "high");
}

function cis_post_settings() {
    global $post;
    $custom = get_post_custom($post->ID);
	
	// maybe we want to automatize this?
?>
	

		

			

				
Deactivate visual editor?
				

					checked="checked" />
				
			
		
	
post_type == "post" || $post->post_type == "page") {
		update_post_meta($post->ID, "deactivate_visual_editor", intval($_POST["deactivate_visual_editor"]));
		
	}
}