Peaked roofs are an undocumented and unsupported feature in VNS. Sometimes they work, but often they don't. That makes them unreliable in a production environment. By the time you fiddle with vertices to make one work (maybe) you could have modeled the building in a 3D application.
There are two problems with using
a Wall Component for retaining walls: a Wall has no thickness
and there's always some space between it and a no-profile ATfx
edge. Add to that the irregular vertical 'face' of the ATfx and
it doesn't hold up in close views. While you can minimize the
irregularity of the ATfx face with high-resolution terrain, high
FD, and low Maximum Pixels per Polygon, the render time cost
is great and the two problems first mentioned remain. While it
is possible to create a retaining wall using a Wall Component,
it is not practical and a better solution exists.
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