In my opinion the best idea would be to release a set of four or five universal sensors. Those sensors should be exchangeable and used for different task. Some programs can ask you, to attache them to your body to track feet, hips or other parts. But they could also be attached to static objects. For example a chair could be tracked by the software and used for interaction. Imagine an flight simulator, which uses a chair as the actual chair in the cockpit. So the player can get up, change something in the ship and move back to the chair. Or an table, so that the game can project a board game on the table. You could even use other normal objects (keyboards, trash bins, etc.) or special controllers (plastic guitar, treadmills, etc). The possibility for sending inputs through the sensor would allow for even more cool options.
The sensors make sure, that any position changes are registered. Since the objects them self are static, you only need one position and register the object as a whole, to make everything work.
This can also be very helpful for future releases for a more mainstream device. If people can register their big, hard to move objects (like tables or couches), the games can consider them and have workarounds ready, so that people can use more active space.
I have a couch in my living room, which of course isn't very high. So technically a game could use the space above the couch for hand movement beyond the walking space. Or even use the object in the game for physical feedback (even so this could be dangerous, if you aren't clear, when something is physical there and when not).
Their are a lot of possibilities with universal sensors.