Well call me a complainer all you want but I do wish slide-to-unlock was an optional setting (to those complaining about alleged complaining).
I have my iPhone set to auto-lock after 1 minute using a Passcode Lock. I really don't see the point in having to slide to unlock and then enter my PIN to use the phone. Seems logical to me that if the device is PIN locked slide-to-lock should be optional.
This doesn't mean I hate my iPhone, I'm just pointing out behavior that I would like to have control over. Why would anyone have a problem with it being optional? If you want it on, great, do so. Those who don't can turn it off. If it turns out to be an issue they can turn it back on.
And don't think that because the iPhone is such a great device that there isn't room for improvement. For example, my Treo's equivalent to slide-to-unlock is called Keyguard (with physical buttons and a touch screen it's needed!). But it has four different settings: disabled, when power is turned off, 5 seconds after power off, and 30 seconds after power off. I set mine to the last option. You honestly don't think it wouldn't be an improvement for slide-to-unlock to have these same options? Do you really need slide-to-lock when you turn your iPhone off then immediately back on?
On a positive note I am pleased with Passcode Lock (though I wish it had more durations than just immediately and 1 minute). I used almost the exact same feature on my Treo, and was concerned that it would be much more cumbersome on the iphone--to the point of almost not even trying it. Boy was I wrong: on my Treo I had to fumble with the tiny numeric keys on the keyboard to enter my PIN, then hit the OK button or tab down to press the OK button with the 5-way pad. On my iPhone I can enter my PIN so fast you can't tell what I am entering--really, I can do it in about .5 seconds.
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Mike