You've changed the way the back key on my device works. It doesn't close tabs anymore. This annoys the crap out of me and is entirely different from what I expect my back key to do and what it does in EVERY OTHER APP!
Please revert this or make it optional. I can't even exit the settings with the back key but have to reach all the way to the top right to hit the back arrow.
I consider Opera broken because of this. Strange this isn't even mentioned in the change log.