Hi, glad to read you love the feature :-)
To record video with controller, just long press the home Meta button then the finger trigger button. It always work on my side. But you can also do that from the Meta camera app. I don't think putting a shortcut button in QGO could be better than that
Anyway, feel free to leave some stars here :-)
https://anagan79.itch.io/quest-games-optimizer/devlog/755873/ratings-reviews