Soldato
He was holding the wheel in a very odd position, which suggests he might have been trying to manipulate a switch/toggle or something that's in an awkward position in a way he normally wouldn't. He then rapidly moves his hand back to grip the wheel 'correctly' as Perez comes across.
Then the car needs fewer switches or all the existing ones need organising better. And there still shouldn't be any way that a single button press can turn off the brakes.