Being able to unbind Start Button on Xbox360 controller

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For now, the Start Button on a Xbox360 controller is hardcoded to behave like pushing Esc on a keyboard, it always open the game main menu, its not listed on the Controls menu, neither on the .binds file, and if I try to bind it to another thing, it just do nothing, like if I click Esc when trying to bind it. This is annoying, because a gamepad already has just a few buttons, and removing one makes it a bit more annoying, I would want to be able to use that key for anything useful, not opening the main menu.