Yes, there is better app for this and it requires a contribution at my store (as it represents more than 3 years of work).
It’s called ecobeeSetZoneWithSchedule and let you define which room’ sensors are part of a scheduled zone during a specific period of the day. It can reproduce the ecobee’s follow me and smart away features with any ST connected sensors.
You can even choose the calculation method for your sensors (average, median, minimum, maximum, heat/min-cool/max).
You have many more features like alternative cooling, zoning with smart vents, etc.
Refer to the ST community wiki for more details:
http://thingsthataresmart.wiki/index.php?title=EcobeeSetZoneWithSchedule
Regards.