John, At this point Surface is very much tied to the data as collected from the FmX. The challenge is that when we write the data back out for use with the FmX, we send the raw elevation data back out to the FmX for it's use. The challenge for us is converting the Lidar data to the FmX format. Not saying it can't be done, but it's not a small chore.
This is on the development list but I can't give a timeline for it.