By the way, it may be worth pointing out that if you are going to use a pz2 to modify an existing IK chain, different figures use different names for the IK chains, this has to be taken into account when using the pz2. The P4 figures use:

rightArm 
rightLeg 
Etc. 

The DAZ figures use:
RightHand 
RightLeg 
Etc. So does Jessi.

I suspect that most if not all recent figures use the DAZ convention. These names are case sensitive. Although the names are case sensitive, Poser will always turn on leg IK for chains named "rightleg" and "leftleg" no matter what the case.

If you want the figure to load with leg IK off, in Poser turn IK off (it's IMPORTANT that you turn it off in poser), save the figure, then edit the internal names (not the display names) of the IK chains in the cr2 by inserting a space or underscore, eg "Right_Leg".

Of course you have just discovered another way to have a figure load with IK off. Don't have any IK chains in the cr2 to start with, load them from a pose file if and when you need them. I never thought of that.

Again a word of caution, you should only delete IK from a cr2 that has been saved with IK off, if it was saved with IK on, the feet may end up being displaced when you load the figure. This is to do with the fact that Poser changes the parenting and hierarchy when you turn IK off.