“MAJ FollowMe” can select a shape from a list. The shape will follow your mouse pointer in Sketchup. In any place, you click you will have a fixpoint, and a double click will make your 3D. You can add a shape to the list (and save it on the hard disk) from Sketchup group, component, or single face simply.
You can download this extension from the following address.
Please let me know your idea about this extension.