If a fellow had wheels back space set up to use spacers at 0 scrub, he could have the option of moving the scrub inboard just a little. FWD drag cars do that, to handle the pitch across when one wheel slips a little, or when an axle let's go, running a spool. I.E.: If the right side is pulling better then the left, the inset scrub radius helps the driver hold the wheel to the right a little (very small), to prevent the front end from "climbing over the left", so to speak. I'm told it's pretty natural when everything is set right....it responds quicker than driver reaction can.
You could use whatever spacing makes the car steerable as the car is worked up to speed (it'll be pretty close to 0, but thin shims are available). I honestly don't know what it'd do on super high HP/speed stuff.... I don't think the front drivers ever got past 1000-1500 HP and low 200mph range (Chevy Cobalt and Chris Rado's Scion TC for example).
Wouldn't be hard to do, and it'd give the option of dialing in the steering without rebuilding stuff.