Suggestion for improvement: thumbnail quality

This plugin is used to reduce the size of an image. An important parameter is the JPEG compression level. However, it only works on uploaded images, not thumbnails. The default jpeg quality in WordPress is 82. If I set it to 70 in plugin options, there are times when some thumbnails are larger than the original (resized and recompressed) image.
I propose an additional option to the compression level: “apply also to thumbnails”. It should be as simple as that
add_filter( 'jpeg_quality', create_function( '', 'return intval(get_option('jr_resizeupload_quality'));' ) );