You can try and set the template for the lists widget to display the comments in a separate page, which should allow you to add comments ( if you have specified it previously in the permissions for each item ). Regarding the rating - we have an article regarding the implementation of such functionality:
It is for blogs but you can try to modify to work with lists as well.
All the best,
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items