Taking the page slug from the post name is frivolous since it can be changed later easily, but since SEO rules, keeping the SAME slug is essential to speed-up the process of the conversion to make it live quickly.
e.g. for a page named Title of Page, whose filename is the-page-name.html
yoursite.com/blog/title-of-page is not bad, but it's rather costmetic.
yoursite.com/blog/the-page-name is a MUST.
Then your rule can be only one, a generic one, redirecting not-found pages with their matching version without ".html"
How do I get that? I can edit the plugin if needed. I just need to know what line to hack it up at.