It's a great idea. It makes intuitive sense. Someone skilled in math could offer you better feedback than I can. Looking forward to some discussion among the tech and quant sides of the forum about how this could be implemented. Thanks!
I'm not sure what the benefit is. It would have huge spikes when very old coins are spent. We have the three graphs filtered by 1 week to 1 year that should do some of what the intention of scaled days destroyed should do.
You can change the power factor until you're satisfied. And the benefit is exactly to warn people when large amount of old coins got moved, as this maybe someone ready to convert into fiats.