I agree it would be a really useful feature.
You can make it happen without the plugin by adding the following to functions.php
add_action('image_save_pre', 'add_image_options');
function add_image_options($data){
global $_wp_additional_image_sizes;
foreach($_wp_additional_image_sizes as $size => $properties){
update_option($size."_size_w", $properties['width']);
update_option($size."_size_h", $properties['height']);
update_option($size."_crop", $properties['crop']);
}
return $data;
}
Hope that helps,
Harry