If you have any sort of evidence for that, I'd like to see it - that's not sarcastic; I just haven't heard that anywhere and it seems like something that'd be heavily reported. Likewise for any other violations. Also, I'm not even sure that swapping seats violates regs. I've got my FAR/AIM right here, perhaps you could quote me chapter and verse?
You need to read the NTSB report. It includes the full CVR transcript. It will turn your stomach. If you read it and don't think these guys did anything wrong, you really need to question your aviation skills. I'm not trying to be rude here, but do you have an ATP?