Can a future release include the head tracking option in Heresphere player where an upward head movement moves the view up, not down? Currently up is down and down is up, which seems counter to most use cases. 

Are you referring to the "Drag Rotation" key binding with the toggle to use your head rotation instead of the controller rotation enabled? The drag rotation operation relies on locking the rotation of the video to your head/controller rotation, so it can't be inverted. What I'd recommend is looking down or up first, and then enabling the drag key binding, then dragging it back to center.