Before I screw anything up, just wanted to make sure that I was thinking about this correctly: Adjusting the camber in the rear will NOT affect toe setting, correct? I can't see why it would. And yes, I know it will change up front, but I'm talking about the rear here.

Adjusting the camber WILL change the toe. I you move the camber you are changing the pitch of the tire( Vertical pitch) hance changing the toe. The correct adjustments are indipendent rear cars. rear camber, rear toe. Front caster, front camber then toe. Toe adj is always the last and any thing you change will affect the toe. Hope this helps. Andy.

I understand why toe changes up front. The hub is fixed on one end by the steering arm. Adding negative camber will force the toe to go in, because it is held in a fixed position in the rear, and vice versa.

I don't see anything like that in the back. Nothing is holding the hub in a fixed position like the steering arm is up front. The camber should be free to move all it wants without changing the toe (unless I'm missing something. What am I missing?)

Ok think of each adjustment as an axis. Camber. the tire (vertical) in relation to the ground. introduce neg. camber the top of the tire tilting in. then introduce body roll. In a right hand turn the body leans to the left. Think about what happens to the right rear tire's toe as the body rolls to the left. The right rear tire toes outward during the turn.
As the suspension traveles up and down the toe changes, or bumpsteer. Looking at the strut and knuckle in a static position seams as only two axis, camber and toe. the big pictue tells the story. I would not change the camber without at least checking the toe.

I think I see what you're saying. I need to think about it some more...

You sure that's occuring because of camber changes or is it supension compression changes (with the control arm moving under cornering load, etc.)

The beat way to see the changes. While the car is on the alignment rack have someone push down on one side of the front corner and look at the screen and see what happens to the rear toe on the opposite corner or move the rear camber to see the changes on the same tires toe. This would be the best way to actually see what moves on the suspension.