Terrain filters have the ability to use the Feature Definition, but a lot of the time we have elements that we do not want all elements of a feature definition to be captured by the terrain filter. Our current workaround is to have multiple versions of Feature definitions that have slight name variations, for us to use in different areas (above or below grade) of the corridor templates.

Allowing the element name to be filtered as well would allow us to create very powerful filters so that automatic surface creation from specified elements of multiple corridors would be easier.