Thanks for the info Narmer, we can do like this temporarily.
But editing original plugin files is not a good thing (break future updates, etc.), there should be some filter available by which this can be done inside theme or custom codes. Basically there should be given some GUI in its admin itself with more options so that its easy to set what needed for different posts/post-types.
Found a plugin that works for google rich snippets, open graph
http://wordpress.org/extend/plugins/wp-social-seo-booster/ , but not support all custom post types in free version. It has pro version for this. But you can install it in a wordpress and see the settings it provide in global and below each post editor page.
Another thing found, the google guidelines for 'product types'
I think, authors will find these info useful including yours, to have some nice implementation. SEO ultimate must improve in these regards to compete with other plugins like http://wordpress.org/extend/plugins/wordpress-seo/ , http://wordpress.org/extend/plugins/all-in-one-seo-pack/ . The SEO by Yoast plugin google snippet preview and page analysis feature looks good (its first screenshot) which could be more implemented in SEO Ultimate.