Hi Dave,
I cannot answer for StockCharts, but I suspect like any business it is always a choice of where to devote limited time, energy, and money. You make some good points and present your thinking clearly. I can see why you like your system. In my case, I do something very similar, but I do it directly with the charts.
This is a great forum to be presenting your ideas. As you orginally said, if enough other people are interested in being able to download that data, and if they contact StockCharts about it then possibly it will move up the priority list.
Well presented. Good luck with it. Hope you will stay around the forum either way. Clear thinking and well expressed ideas are always valuable.
Cush