Orientation is for aligning a joint with respect to the world coordinate system (where they start if the orientation is (0,0,0)).  This is usually used when the body part geometry is modeled off orientation with the world system.  Orientation is independent of the rotation dial values - think of it as a pre-rotation - and it does not change the body part geometry, just the joint of the body part.  It also does not change when rotating body parts - only if you change the orientation in the Joint Editor.
For V3's hip, this might be some sort of modeling of the real hip orientation.  The rotations are very small (less than 2d for any of them).  Could be that they didn't care about the slight orientation or it could have been intentional.  You'll need to talk to DAZ about that. :)

Personally don't think there is anything to worry about.  If you want to rotate the entire figure, best to use the BODY instead - which happens to have (0,0,0) orientation.

Robert

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

Contact Me | Kuroyume's DevelopmentZone