I've seen an error on Cloudflare enabled sites way more than a cached version of a page when trying to access a down site, so hopefully these changes will mitigate that on static websites.
CloudFlare has saved me a number of times,but when RackSpace had a database error for about 22 hours,the database error wouldn't trigger the cache. I would love to see the ability to trigger on keyword or at least the ability to manually force cache mode!