The man wants MORE caster. How about this idea?

Dale Davies said

Increasing caster increases camber change in a beneficial manner. As the body rolls in a corner, both wheels lean over, the outside wheel wants to add positive camber and the inside wants to have negative camber. On unequal length A arm suspension you want the outside upper control arm to pull the top of the wheel toward the center of the vehicle. In like manner you want the inside wheel upper control arm to push the top of the wheel out. This works to maintain as much contact patch area on each tire as possible. The outside tire gets the weight transfer and is required to do the most to keep traction in the corner.
Increased caster also aids camber gain in a desireable direction.

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Yeah, that's what I said. In a perfect world the combination of your static camber, camber gain from the control arm travel, and camber gain from the caster angle would combine to match the lean angle of the car and keep the outside wheel flat on the ground to maximize traction.

@inertia 's question was about fuel mileage, and the way that the geometry works, if everything is set up perfect in a perfect world, you'd maintain the contact patch you'd have when everything is going straight and level. Realistically, the best you'll do is maintain the contact patch on the outsidee wheel, with the inside wheel patch getting smaller as the weight of the car is shifted. Regardless, you're not going to be increasing the contact patch overall, so, no lost mileage.