Camber to dial out under steer?

[Bruce in Philly]

2009 C2S coupe

I am having an alignment done and I would like to dial out some under steer and make the car more neutral for very light track use. What is possible... and what do you recommend? Any downsides to this?

Also my rears wear on the insides way more than the outsides.... would it be possible to achieve my objective above by taking out some negative camber in the rear and getting a bit more tire life too? Is this possible? Just thinking as it looks like Porsche dialed in some negative camber in the rears.

Micheline Pilot Super Sports
Stock S suspension - no desire to change out parts

I am not sure what is possible with a stock setup.... I am not interested in an alignment that will accelerate tire wear as I use my car as a daily driver. But I really dislike under steer when I go to the track.

Thanx
Bruce in Philly