I don't need WordPress SEO to touch my page titles and I would have thought that if I had 'Force rewrite titles' unset and no values in the SEO Titles anywhere then my page titles would not get changed.
They are however being changed. I'm getting the site-name used twice eg 'page-name - site-namesite-name' and for the WP e-Commerce product category pages the word 'Archives' is also being appended to the page name.
This may be a miscomprehension of my part but I don't understand why the titles are being updated. My expectation was that I'd effectively turned off the page title handling in WordPress SEO but that doesn't actually appear to be possible??