When you run rear toe in two things happen.

First realise that when cornering the outside wheel does most of the work. That means if you run toe-in on the rear the outside wheel will be pointing to the inside of the corner.
Because of this the car rotates less aound the top axis but also moves sideways. Therefore the front will need to turn more to compensate this effect = less steering.

On throttle toe-in has a stabilising effect. Now the wheel not only points to the inside of the corner, but the acceleration force of the wheel will also be directed that way. This counteracts in part an oversteer situation.
Under braking unfortunately things are reversed. The braking force in this case actually pulls the rear out of line. So more toe-in will not help a car that is unstable during braking.

It has not a lot to do with big or small tracks. I set toe to be a compromise. I will try to run as little as possible and use it to balance the car under acceleration.