Possible to add new token %parent_title% ?

A while ago I realised that post_name in WordPress never changes after a post is created. For instance, updating a post’s title does not update post_name.
On my site, I needed to have child posts to have a permalink like /parent_name/child_name and started using the %parent_postname% token. However, when I changed the title of a parent and regenerated the permalink for a child, the parent_name part would not update.

I resolved this issue (been testing this for over 6 months) by creating a new %parent_title% token, which simply uses post titles instead of post names.

Would you consider adding this to the plugin? Please find the code below (it was duplicated from %parent_postname%):

// Replace %parent_title% with the respective post title with the
// parent post title if parent post is selected
if ( false !== strpos( $replace_tag, "%parent_title%" ) ) {
  $parents = get_ancestors( $post_id, $post->post_type, 'post_type' );
  $posttitles = '';
  if ( $parents && is_array( $parents ) && ! empty( $parents )
    && count( $parents ) >= 1 ) {
    $parent = get_post( $parents[0] );
    $posttitles = sanitize_title( $parent->post_title ) . '/';
  }

  $title = sanitize_title( $post->post_title );
  $posttitles .=  $title;

  $replace_tag = str_replace( '%parent_title%', $posttitles, $replace_tag );
}

Many thanks,
Luca