They should consider selling accessory units that plug into the wall and monitor the temperature of a specific spot in the house, syncing with the master control via wifi (instead of only reading temperature/motion in the one place the thermostat is installed).

I'm thinking of a corner in our house that is always cold -- if it detects I'm there, crank up the heat so it is comfortable in that location. When I leave, do the same for the next spot, or revert back to the "master control" unit. I'm not sure how much money this would save, but it would certainly be a valuable feature I'd pay for, and it would knock the socks off what any normal thermostat could do.