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<?php
function disable_visual_editor_in_page() {
  global $typenow;
  // 投稿の場合は'single'
  if( $typenow == 'page' ){
    add_filter('user_can_richedit', 'disable_visual_editor_filter');
  }
}
function disable_visual_editor_filter(){
  return false;
}
add_action('load-post.php', 'disable_visual_editor_in_page');
add_action('load-post-new.php', 'disable_visual_editor_in_page');
?>

<?php
function disable_visual_editor_in_page() {
  global $typenow;
  if( $typenow == 'mw-wp-form' ){
    add_filter('user_can_richedit', 'disable_visual_editor_filter');
  }
}
function disable_visual_editor_filter(){
  return false;
}
add_action('load-post.php', 'disable_visual_editor_in_page');
add_action('load-post-new.php', 'disable_visual_editor_in_page');
?>