I originally used this extension to emulate the function of a Firefox extension called ResizeIT (https://addons.mozilla.org/en-US/firefox/addon/resizeit/), which is less robust than yours but adds one great feature: hotkeys. You can see the entire concept in the screenshot at the link above, but basically it just predefines Alt-1,2,3,4 etc for use with the presets, which can be position, size, or both (like yours). I don't think these particular hotkeys are in use in Chrome, but if they were somewhat more modular that would solve that. Either way, it makes it very accessible.
Generally, it just makes organization so easy and quick for people like me who have 100s of tabs and 50+ windows open at a time and would be a great update to your already-excellent extension ;-)
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