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No. Rating can be done by all users who have (at least) “Reader” rights. When rating a list item (or a document), the item is not updated by the user. That is, its Updated and Updated By fields are not changed.
Yes. You can create a Rating site column, and then add it to any content type you wish.
No. KWizCom SharePoint Dual Lookup is a server installation.
Yes. KWizCom SharePointRating Solution supports both MOSS 2007/WSS 3/0 and SharePoint 2010/2013/2016.