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.