I have a Mac with FileVault 2 enabled, and recently upgraded to Mountain Lion.
Apple automatically enables the option to unlock my system account using my Apple ID in Mountain Lion, and because I have FileVault 2 enabled also hides the option to disable this feature.
If I want to disable "unlock using Apple ID" I can decrypt my drive by disabling FileVault, then the option will appear again. I can then disable the option and re-encrypt my drive by enabling FileVault.
I don't want to do this: How can I disable "unlock using Apple ID" using the command line or skipping the decrypt/encrypt step?