Pues en el plugin oficial pone:
Cita:The plugin currently supports the following features, which can be enabled and configured individually:
    * Google SEO 404:
      - error pages return 404 error code instead of 200
      - add Google's 404 widget to 404 error pages
      - custom 404 error pages
    * Google SEO Meta:
      - generate description meta tags for forums / threads / etc.
      - specify canonical pages
    * Google SEO Redirect:
      - redirect old URLs to new URLs
      - this avoids URL breakage and double content
    * Google SEO Sitemap:
      - dynamic generation of XML Sitemaps
      - search engines find your content without crawling
    * Google SEO URL:
      - replace standard id based URLs (e.g. showthread.php?tid=12345) with name based URLs (e.g. Thread-some-subject)
      - UTF-8 in URLs is supported
      - uniquifier is applied for non-unique URLs (see documentation for details)
Si entienes inglés genial, sino pues trato de mediotraducírtelo, pero yo de inglés no controlo tanto. xD
Y sí, se puede activar cada cosa por serparado.