SP - Extrude Compound

This modifier allow to extrude curves or flat patches in a specified direction. The extrusion result has several surfaces, meaning the modifier must be on a compound object. - The extruded curve or flat patch can either be from a separate object target, or from the mesh of the compound itself (Extrude Self option), in which case no target is required. - The direction and length of the extrusion are either controlled by the Direction and Offset parameters or by an edge in the mesh if Use Vertices as Offset is enabled.

Example of shapes this tool make simple :