Not true. On the rear, both toe and camber can be adjusted independently. However, the factory range is limited; that's why people opt for adjustable control arms for track use.
A competent shop should be able to correct your problem though. Also consider that you might just have worn bushings, and replacing them might get your angles back to factory specs.
It's the front camber that isn't adjustable, although changing the size of the upper hub to strut bolt can make up to a 1 degree difference.