3D tool in v4 - can I have a bitmap fill on the SIDE part?

[steve.ledger]

Alternatively, since an extrusion can easily be converted into a vector:
-Create extrusion
-[Convert to editable shapes] so that you now have a vector shape

Um.. could you explain how you see a rasterized extrusion becoming a vector?
With my version of Xtreme4, converting an extrusion to an editable shape converts the extrusion to a flattened bitmap which has an editable boundary matching the shape (you need to set a line width to see this), with the flattened extrude becoming a bitmap fill.
The extrude itself is not vectorized or traced by this process. Unless I've missed something?