The 488 GT3 has a remappable steering wheel, so you can make whatever button you want a killswitch. In that photo, they've mapped it to the flashing lights button, so presumably, that's a series you don't flash much.
The 919 layout is perfect from a "control room ergonomics" point of view (corporate BS name for one of my work-related tasks), as the shroud around it makes it very unlikely that it will be hit accidentally.
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