I know this is an old post, but I thought I would put my 2 cents in. I just installed a free application called Roll Swap. It allows you to swap the current camera roll with a different one. You can back up your photos how ever you want to, click and drag (pc) or iphoto (mac) swap the roll with the app and delete the application. When you delete the application, all data gets deleted with it. Make sure you have a copy of the photos you want to keep before you get rid of the application.
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