i'm currently running -1.6 degrees of camber up front and -1.2 (i think) in the back. no problems with tire wear - in fact, i'm wearing the outside edges a little faster than the inside ones and am thinking of going to -1.75 up front. my car's also running spring rates ~3x stiffer than stock..
you can get adjustable link sets that let you adjust rear toe and camber. they seem to be pretty hardcore - stiffer bushings and all and not designed for most street cars.
you can get adjustable link sets that let you adjust rear toe and camber. they seem to be pretty hardcore - stiffer bushings and all and not designed for most street cars.