You can use gateway devices very similar to the Quantum Builder Bases.
Except that gateway devices get automatically added to you device list once you have setup the gateway.
Example screenshots with Samsung SmartThings gateway devices:
You can map your newly created Gateway devices just like you are used to.
Example - Make Demo App for the SmartThings Motion Sensor
Make Demo App from the clients view
Mapping of gateway client in app view
Now inside Inside the App Screen when starting the application you will be able to map all the motion sensors on your system.