Now that the iCloud works (almost) flawlessly on both my MacBook Pro and iPhone I get annoyed by Mail.app on my Mac which seems to update contacts in my address book on its own, without my request or approval. I can't seem to find any setting to switch this behaviour off.
As clever as it may be (and it seems to be, as it does update correct contacts with valid information), I don't want it. Here's why... I prefer to keep some contacts in my address book with nicknames only. Since address book doesn't consider nickname as a name when sorting, contacts with no first/last name end up and the end of the address book as unnamed. What I do is I put the nickname as the first name. And that works flawlessly. But whenever I reply to an email from a person that exists in my address book as a first-name-is-nickname it updates the contact information with the last name based on the From/Reply-To header in the email.
How do I prevent this?
-- edit --
No solutions here so far so I've posted the same question on Apple Communities.