so the current issue I'm thinking of is tracking VR controllers position and rotation to align a picked up item into a specific rotation and position on the hand (like a gun or a microphone or whatever). Additionally I gave thoughts to how it could be done in VR vs desktop mode. For VR its obvious. the allignment of the hand happens naturally.. for desktop mode the user could be able to switch camera to the hand and position it via mouse. So the IK of the body follows the hand in that case, just like the body follows the head in VR mode.
VR controller tracking / picking up items VR/ desktop