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.