Ah, I wasn't holding the key down, just pressing it quickly. Thanks so much!
Since you missed that, you probably missed these:
Hold the PIPBoy key for a flashlight toggle
Hold the VATS key for a zoomed-out VATS selection. While continuing to hold, targets glow, and it centers on the selected target. Press left/right to change target. On letting go, it will zoom into VATs targeting mode on that target.
lol Kaspar, you ninja you