Check out this article from USA TODAY:
iPhone app heats up debate over sexting
Could smug find a way for us to use this or something comparable. . Would take care of the public stealing our pics. Thanks Bill
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Your idea would basically have to be published elsewhere, generally please spend some of your time to avoid wasting others, by skimming through FAQ pages before you write something at all.
Giving you the benefit of doubt:
Why would we even want that? This is good for people sending naughty stuff to each other and not much else. SmugMug already employs a wealth of features to help you hide anything and everything, including "usable" versions of images. If I was browsing a gallery and could not go back and see the previous image again because I've "spent" my alotted seconds, then I'd most certainly leave the site immediately.
You're not serving a pr0nsite off SmugMug, are you now? :P