Are the never ADC thermostats internal relays better designed to avoid the system protect and more forgiving?
Yes, the T3000 used digital relays and was designed to be very sensitive, the other models use physical relays and are more forgiving on electrical deviations.
We do not have any plans to stock the Alarm.com RTS Remote Temp Sensors at this time. As always, compatible equipment can be purchased elsewhere and still be used with service.