Hello, 

I think that a "weather station" type of device would be very handy to have. Wall mounted display that would sync to outdoor sensor(s) for monitoring the current weather and/or add-on units for detecting windspeed, rain gauge (in./mm of rain accumulated after a rainshower). I understand this would come with a high price. 

Or, 

Maybe a larger display for the gen 2 room and humidity sensors? This would be more budget- friendly and much easier/quicker to develop.