I am looking for an option to add the choice "Add to Existing Contact" from the Apple Mail.app From address field. As you all know, we have "Copy Address, Add to VIPs, New Email, Add to Contacts, and Services" as current choices. I am hoping that I can find a way to have an additional choice of "Add to Existing Contact" to this list - maybe listed under Services.
I know that this is a choice when you use the smart detection feature from a signature. I also know this is an option in iOS 6. So how can I get the same functionality for From: addresses in Mail.app?