Interesting how we look for different things in our cars.

I personally dislike the 'dull' feel you get from most all PAS systems, I love the communication you get back from 'alive' steering.

Having said that, tramlining on a road vehicle is a PITA, and you can get that just from a particular tyre type, depending on construction, ahs to a lesser degree pressure, done tyres just follow road irregularities more than others.
A more common problem is too much toe out (or any tie out on a RWD)
This makes it almost impossible to keep a straight line on a RWD car, and while front and all wheel drives often need a small amount, too much will do the same thing.

Funnily enough I always set up race cars with varying degrees of toe out, to the point some were absolute bitches to keep in line on a straight, but when you are looking to maximise turn in and generate fast lap times, who cares, but on the highway the same setup is too tiring in about thirty seconds flat.