Partial Rotate Extrude (OpenSCAD)

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In designing a printable frame for a mini quad copter, I discovered the need for a feature in OpenSCAD that hasn't been implemented yet. Although not perfect, I found a workaround that sufficed for my requirements. The example use case is provided. To utilize this (similar to rotate_extrude), you can use partial_rotate_extrude(angle, radius, convexity) circle(5). This will extrude the circle for the specified angle degrees about the origin at a distance of radius. The convexity parameter operates the same as in rotate_extrude; refer to http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/2D_to_3D_Extrusion for more information. For accessing and copy-pasting, use partial_rotate_extrude(235, 20, 10) circle(5). Additionally, I've created the pie_slice module to generate a slice of a pie with radius 'radius' and angle 'angle,' divided into 'step' sections. The module linear_extrude is used for height 'height' with center set to true. Lastly, the partial_rotate_extrude module intersects rotate_extrude (with convexity 'convexity') translated by 'radius,' and pie_slice(radius*2, angle, angle/5) as child(0).