I would like that you could "anchor" a Conventional fixture to it's XYZ postition, and be able to follow another Object transforming the rotate XYZ values of the fixture. Getting this a step further, anchor a moving head to a moving truss and controlling the Pan and Tilt of the moving head. A kind of "Look at and follow" function even while moving.

Imagine a spot following a kinetic LED ball for example. Moving heads following a singer maybe.