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Re:FBI agrees to unlock iPhone for Arkansas prosecutor by copperx on Thursday March 31, 2016 @03:05AM (#11395489)
The feature is there. Change the 4-digit pin in the Preferences to an alphanumeric password, and the iPhone will work exactly as you described.
Re:FBI agrees to unlock iPhone for Arkansas prosecutor by mikeash on Thursday March 31, 2016 @12:31PM (#11398420)
There's no built-in feature that lets you use a simple passcode after the initial unlock.

Touch ID ends up working like this, where your fingerprint takes the place of that simple passcode. But for people who don't want to use a fingerprint, you're stuck using the same passcode or passphrase for each unlock.

Re:FBI agrees to unlock iPhone for Arkansas prosecutor by x0054 on Thursday March 31, 2016 @11:35AM (#11397921)
There is no pattern password in iOS. It's only a numerical or long form password.