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If you haven't tackled this yet, I'd suggest the Redirection plugin for Wordpress for IF you need 301s. I've only used Studiopress a little bit, but I imagine it has some features similar to Thesis. With Thesis, I can change on the fly what pages I want in my menus. The pages themselves (their contents and URLs) don't change at all, I'm just choosing to now have "About Us" shown in the menu and not show "USS Iowa" in that menu. If my husband adds a new page to the site about flags for our ships, but forgets to put it in the products folder, I can edit that page and the Redirection plugin automatically creates a 301 redirect for me. Likewise if I make a typo in the page name and don't catch it until after the URL has been created, I can change the URL name and the Redirection plugin automatically creates the 301 redirect. This paragraph applies to any WP install with that plugin, doesn't matter the theme you're using, just make sure that option for automatically doing the 301s is checked. Does this help at all?