I'm trying out your plugin with my Headway 3.1 install. My blogs posts index page has enough posts to enable pagination. Prior to trying you plugin, I saw that Webmaster Tools was telling me that all the subsequent pages (page 2, page 3, etc) have duplicate titles with the main, page 1 page. (And I didn't see any canonical lines in there either, although I do see "meta name='robots' content='noindex,nofollow'"). So that's when I installed your plugin to see what it did.
After installing your plugin, I still see the duplicate page titles when I view the page. However, now I see the canonical line in the source and the "prev" line along with it.
With these two lines added to my subsequent, paged indexed pages, are the duplicate titles I see in all the pages okay with Google now? And if so, will Webmaster Tools then understand and not give me the duplicate title warnings?
Thanks so much. I think I am going to use Transport to move my Headway data to your SEO plugin and then start using it.