Average haul length of the design would be great.
Sorry for the delay in getting back to you. We did implement this feature quite a while ago. Go to Tools > Cut/Fill > Recalculate > select Triangle Method. The cut/fill summary will show you the Centroid Haul Distance which is what you requested.
However, more recently we have developed our Optimum Haul Analysis (OptiHaul) which is far more advanced and will show you the optimum direction to haul cuts and also estimate the average haul distance and time to complete the job based on machine capacities, speed, etc. This is explained in detail in this video here: https://youtu.be/xUOB_sZm93g