Wes, I have several scenes for the thermostat for different set points and an OFF scene to turn the thermostat off. On the ISY I can go to the scene and set it on and it sends the set points and mode to the thermostat. In MobiLinc when I push ON on the scene I get an error "Bad Message" ISY failed to process the request. Please try again.
I can adjust the set points manually on the thermostat screen.
I think this may be because you don't allow access to a thermostat anywhere except the thermostat screen. It sure would be useful to be able to control a scene with just the thermostat node in it though.