selectable thermostats?
Though it's not quite the answer you're looking for, the Ecobee3 might be worth considering. It has remote sensors, and you can control which sensors are active as part of the schedule.



I mainly bought this to keep the upstairs (and baby's room, in particular) at a better temperature at night, which works extremely well. It's also helped keep a better balance between the front and back side of the house, which has large south-facing windows -- though I think that's actually more due to the ability to run the fan for a minimum number of minutes per hour.

I have no affiliation with this product or company, I'm just a satisfied customer.