Yes, that’s a very good idea. It would enable power usage accumulation for devices that measure power, but doesn’t store the accumulated energy spent. It would of course be an estimate (since it relies on reported values and that the power is constant between reports), but much better than nothing.
If possible, it would perhaps be better if one could enter all pricing information in just one location, and not have to re-enter everything for every device, but I suspect that would mean quite a rewrite of the app, since currently all settings are tied to the device instead of being global for the app.
