Sounds neat. I can see uses other than for cameras as well.
But in most most digital cameras you cannot hold the internal shutter open indefinitely ( the old "bulb" setting ). So you would need to somehow interface with the camera enough to open the internal shutter, do the good stuff with your external shutter, then close the internal one. Once you can interface that far, you might as well use the internal shutter. These already have speed ranges of typically 1/2000 down to 8 secs or so.
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