Provide correct information
I just read Zac Palmer's blog on the Mercedes steering trick.
He keeps referring to toe out.
I believe he is talking camber.
Toe in/out is the front of the tire vs the rear of the tire. Wider at the front is toe out, narrower at the front is toe in.
Camber is leaning in/out at the top, And yes, most race cars run negative camber (in at the top) to help the car corner more stable. When you lean on the front tire in a turn, especially on a banked track like in NASCAR, you gain camber, and you don't want to gain too much. And, negative camber will make the tire wear more on the inside edge, and run hotter in that area as well.
Zero camber on the straights would help the entire tread to contact the track, and allow it to cool off.
I have no idea how you could adjust the tie rods at speed to change the toe.
With a movable suspension part, you could, however, change camber.
changing the camber would be "active suspension", not allowed.
Moving the whole steering rack in and out will allow the change of toe in - toe out without being considered "active suspension".
On the straight line speed toe out or toe in will scrub the tires, with neutral toe the wheels will run straight no scrubbing thus more speed, then in the corner you put the toe back in for more grip.