allow only the author of the comment node I want to make an option to subscribe to news within the node, node - it's maintenance team that adds news. I decided to do with the comments as flag in this case does not fit. Everything seemed to be fine, I can add the required fields in the form of comments and install the Node notify that and give the ability to subscribe to a node. But then the question I give the ability to add comments to the author node and not the whole role, and I need to limit the addition of the comment and make only the author can add nodes. anonymous and everyone else can only view and subscribe.
Sorry for my English. Thanks for any help!
In the permissions of  Comment you can allow Post comments for your author role alone.For anonymous user you can give permission of view comment alone. Hope this helps you :)