Path Profile - Parallel Profiles
The Perpendicular Profile option added to the Path Profile/Line of Sight dialog a version or two ago is quite powerful. I'd like to suggest a companion feature: Parallel Profiles. For example, when looking at elevation data along a roadway (existing or proposed), it would be helpful to be able to simultaneously see the path profile at 10m or 20m offset (both sides) to see what the cut/fill scenarios might be. This is often called the "ditch line" in the transportation sector.