Not Bad, But Not Updated
It does the trick, but as others have commented, the app has some interface quirks (e.g., can’t re-order destination lists, favorites don’t appear to stick), and there’s no time-delay option nor ability to save to PDF. More importantly, the app hasn’t been updated since December 2013. Nor for that matter has the developer’s twitter feed. Nor does the developer respond to support questions. In other words, they’ve given up supporting the app.
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DreamShot: Screenshot Shortcut