I really like the look of Twenty Eleven, and want to use it for my blog, which has over 1000 posts and pages. But this is currently impossible for me as I need a sidebar visible with single posts and pages, not least for my AdSense ads. See my new post WordPress Twenty Eleven: give us back our sidebar! for more explanation. Is there any way to show this sidebar on each post and page, which doesn't involve editing the 1000+ of them individually, or re-editing the theme each time WordPress is updated?