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Oh, then OSX's sudo has little reason to not use PAM. In which case, this project would be better written as a PAM module instead of a sudo fork.

Guessing so since that's what Yubikey appears to do: https://www.yubico.com/support/knowledge-base/categories/art...

Yep, I've used the Yubikey PAM, and it works just fine. My first thought on seeing the title was: WHYYYYYY?

There are some slight usability issues with using custom PAM config. E.g. if you want to unlock the lock screen without password using the Yubikey, you still need to press enter.

Yes you can, at least you could 1 or 2 releases ago. I wrote one module and it worked perfectly.

Edit: grammar

Do you have a link?