[Plugin: Multiple Post Thumbnails] Image linking option

Would it be possible to add another option, or add to the attribute field what image size to use when you wrap thumbnails in an anchor? I have a client that doesn’t know how to size photos, and they are uploading large resolution photos, so when they click on the photo, it fills the entire screen.

Right now I substituted the full image for the large image using this code:

if ($link_to_original && $html) {
  //$html = sprintf('<a href="%s">%s</a>', wp_get_attachment_url($post_thumbnail_id), $html);
  $imager = wp_get_attachment_image_src($post_thumbnail_id, 'large');
  $html = sprintf('<a href="%s">%s</a>', $imager[0], $html);
}

But if they update the plugin, I don’t want that to get erased. Maybe the option is already there?

Thanks!

http://ww.wp.xz.cn/extend/plugins/multiple-post-thumbnails/