There is an interesting example that show how to use function nodes to generate parametric list of points to draw 2D objects.
Take a look to nacaprofile.scad and callnacaprofile.scad examples.
As some module can output some 2D objects, there is a new node called Callmodule2D in this version.
2D nodes are now visible in Openscad without using linear_extrude.
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Thanks for your comments. It will help to get a better tool.