One interesting thing about Btrfs here is that it really doesn't give you a lot of levers to pull. The idea is that the filesystem code is just supposed to work: there's no real reason to have a million little utilities to work around bugs; the only really legit configuration option is "I know that some of this data might be corrupt, so please just try to give me something from my now-broken filesystem" as opposed to "please guarantee me the maximum correctness possible using all the checksums and redundant data you've got" which is the default behavior.