Hi, thanks for your positive feedback.
Sorry this plugin doesn't include those features you've mentioned.
Yes, you could add them using other plugins and/or utilising this plugin as a basis and then getting into the code and adpating it to make it do these other things. But no, its not a quick easy answer sorry - it would require a knowledge of plugin development. If you're keen to do it I'd suggest you take a look at some of the eCommerce plugins that include ratings and comments and look at how they achieve this in the code, then see how you can integrate into this plugin, or do a plugin of your own from scratch based on the ideas.
Hope this helps