Most control surfaces began lockup up at 480mph... Bomb bay doors weren't meant to be fast speed brakes at extreme speeds. They just covered bombs to reduce drag. They didn't have super strong motors and they weren't made super rugged to withstand that kind of force. Again: He's talking about abusing the game and asking for a game-the-game mechanic. Nothing more.
No, he isn't. As I've already tried to explain to you once you open the doors at lower speeds to reduce the acceleration nose-down or dump retained energy. The 480 mph quoted is the speed at which you lose surfaces. He's not asking to open the doors at those speeds, try to keep up.
Using the bomb bay (the doors open longitudinally anyway) as a brake was mentioned in a British documentary which is available on YouTube I believe. Others have seen it too if you care to read the thread carefully.
Unless you have absolute proof that they were used this way at maximum speeds up to and past VNE (HAH!) I don't think you have a leg to stand on.
For someone who never substantiates anything he says, your demand for absolute proof is incredibly hypocritical.
If other bombers can leave the bay empty and still open the doors then this is simply a bug.