Star Ratings on Testimonials Plugin (and user submission)
Add Star Ratings to Testimonials Plugin (like Rich Reviews Plugin - http://wordpress.org/plugins/rich-reviews/)
Also allow people to post their testimonial using a form (that you can approve before publishing).
Howdy Nichol commented
Star Rating on Testimonial plugin add client testimonials and customer feedback on your website. This star rating adds social proof to your website, which helps you win new customers and boost your business sales. I add testimonial plugin on my homepage (https://truthinequity.com/) which helps to get new customers.
AdminJames Koster (Admin, Automattic) commented
This sounds more like a reviews engine than a testimonials plugin. Similar, but with a distinct difference imho. I think of testimonials as being specific to a particular client/project. Reviews are more generic and can be for anything, a product, a service, an event etc. Based on that I think it's unlikely we'll add this to our testimonials plugin.