To help combat popping between IK/FK make sure you have a 3 degree bend between your bones when rigging. If you straighten out the bones of any IK/FK set up even a custom one, it will have trouble figuring out which system to use. It's why biped and 99% of all rigs have atleast 3degree bends in the limbs, so make sure your…
Selecting a pivot from the worker for biped script, is that the same as the Key info roll out select pivot. Thanks for the Info, Looks like you have has a lot of practice with CS. I am pretty close to finding a solution with cryptic to biped I will post it here. It would bee nice to have another tool to use.