Thank you for contacting Oculus Support.
Although Oculus has not released any information in regards to using extension cables, in general, using an extension cable can cause a slow down in data and may be noticeable.
For the best possible experience, we would recommend not using extension cables on any of our products.
Please let us know if you have any further questions.
Just because I was curious myself, I got some USB 3.0 and HDMI extension cables. I used them with both the sensor and the consumer headset. They're standard 10 foot passive cables. They seem to work with no problem. Cheers.