If you need tags only for news, use core plugin (there are two, one works with keywords as tags)
Old tags plugin connects different parts of e107 system, not only news. You can add the same tags to news, pages, download, content or any plugin you add to this plugin.
It had its own SEO functionality, it needs to be rewritten.
Plugin is under development and you can see it on this site.
is now available for e107 bootstrap CMS.