Head tracking can be inverted on the head tracking page of the vorpX ingame menu (press DEL to access the menu).
The Pipboy is best used in EdgePeek mode. Press the mousewheel to switch to EdgePeek and back. If you use the vorpX gamepad emulation (preconfigured in Fallout 4), this should also be possible by pressing one of the thumbsticks IIRC.
You can change the button mapping of the gamepad emulation on the gamepad page of the vorpX ingame menu.