Dan select the body part you wish to remain in place (turn ik off), click object then lock actor. I would suggest to just get the pose how you like it and save it to the libary instead of text editing the pz2. the x and z trans on the hip move the figure forward and back, but most poses tilt the hip so if you 0 the y tran (make it face default camera) you will damage the pose and have to adjust it alot anyway.