Aahhhh I see. I read contact closure as “contact enclosure” We’ve been getting all of our enclosures finished for production and its been stuck in my head. I can’t seem to find the example right now, but I have seen plenty of Z-Wave products you could use.
I recently wired this Z-Wave relay up to a garage door to control it via SmartThings. While that may be overkill, a simple contact closure is absolutely possible. Unfortunately at this point we don’t have any plans to manufacture our own off-the-shelf version. That’s not to say we wont be compatible with Z-wave or ZigBee HA modules.
Once the ThingShield and ThingModule are released, you very well could hack up your own. You could also use your idea of simply shorting our open/close sensor, but that may void your warranty I agree that the battery would not be sufficient for driving circuits, but the SmartSense Motion has an option for micro-USB power that you could hack into.