I would love to be able to integrate this with smartthings.
DAN (ogiewon) has created a very robust library for the Smartthings Arduino shield. He has mentioned a few time he's considered integrating a wireless solution, and if he does he'll integrate with MySensors.org.
If there is someone who could help him tackle some of the work he may be interested.
You can read more about his ST arduino integration here:
https://community.smartthings.com/t/announcing-the-st-anything-arduino-thingshield-project/9087
and the library can be found here: