I have a security system that supports the control of Z-Wave devices. It would be great if Indigo fully supported including the security panel as a secondary Z-Wave controller. The main usage model would be that Z-Wave devices could be controlled by both Indigo and the security panel. This way Z-Wave devices could be integrated in scenes on the security panel/website (ex. "Arrive at Home" would disarm the security system, unlock a door and turn on a light) and Indigo features (triggers, schedules, etc.) could also control the same Z-Wave devices. As devices are added/deleted in Indigo, those changes would be propagated to the secondary controller.
There are probably other features defined in the Z-Wave specification that relate to secondary controllers so the request would be for Indigo to fully support secondary controllers as defined in the Z-Wave specification. Hopefully this would allow many types of secondary controllers to "just work" with Indigo.