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Magnetic roofing boots.
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Previously:
Hammer with magnetic soft face - GIF
Hidden drawer with magnetic lock - GIF
Magnetic doorstop - GIF
Magnetic drywall cutter - GIF
Magnetic invisible fasteners - GIF
Magnetic manhole cover remover - GIF
Truck-mounted magnetic road sweeper - GIF
How much traction would this add? If there's +20 lbs of attraction due to the magnet, but your body weight is already pressing the shoe against the roof, it's only going to be a 10-20% difference depending on the angle. Not nothing, but probably not a huge difference either.
Also props to the sales guy who faceplanted into a metal roof by walking on a metal roof with sock feet. That's commitment to the sale.
We had a guy working on our metal roof a couple of weeks ago. He let me try out his magnetic boots. nova_robotics is correct, it's only a small difference, but it is a noticeable difference. They are not designed to fasten you in place, rather to simply LESSEN the chance of you slipping. A good investment if you do that kind of work.