I absolutely have no clue why anybody would want to "rig" shoes/boots.

Take a shoe, boot, position it over the foot/toe, and save it as a "smart" prop of the foot with inherit bends checked ON.

The shoe/boot will follow all movements of the shin, foot, and toe's.

A "smart" prop will follow all movements one group up and one group down.

 

Same for "smart' propping hair.
Smart prop it to the neck, and it will follow all movement of the head, neck and collars.

The group it is parented to plus; One group up, and one group down.

Why make simple things so complicated?????
KISS never fails. :-)

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!