I've somehow managed to make my N900 detect movements (and their distances) by checking how the echo of a sound is altered with a Python script that's rather dirty than quick. The way It's recording and playing audio is more a hack than a proper solution, but for some reason it's working. It requires python-numpy and alsa-utils to be installed.

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a plugin for the photos app that can zoom in or a plugin for omp to forward rewind or play with the volume or any crazy idea that can be implemented
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but as the op says its quick and dirty it seems it can be taliored a bit to cerate some fun things or better a script or a app that can be used to intregate whatever one wants like we use shortcutd or camera half press to map any function
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