The height of the heel controller is generally the same height as the toe controller. The scaling of the heel controller just controls the size of the controller, so whatever size you'd like it.
I won't be able to double-check until this afternoon, but, if I'm remembering correctly, the auto shrug bone is just a controller that can be located anywhere (check it's location in Squetchy Sam).
For the other questions, I'll have to be looking at it. I'll knock out a quick video this afternoon and post it.