Pin the interface

While watching Demon Squad today and trying to comment alongside watching it, I was frustrated that it was hard to do so and correctly post the appropriate timestamp, because every few seconds the user interface would go away. I would like a “pin interface” button to allow the interface to stop it’s “auto-hide” functionality. It should be optional of course, and probably off by default. But I’d like that option. It would make “side-riffing” with friends on the forums much easier.