Not exactly what you want but the Shape Generator plug-in may be useful in some cases. I use it to create almost every model part before I edit and assemble them into a model. In most cases I run it through Blender to add or remove some faces and merge groups. And of course Blender allows to smooth choosen surfaces.
There is also a BasicShapeGenerator plug-in which allows you to create several different basic shapes like pyramid, cross, torus, and more.