I'd really love to be able to select points from a point cloud and create a planar surface from selected coordinates. Further on I'd like to be able to select the points to be used as polygon boundary of that surface.
So... Pick a lot of points from the point cloud, select points for boundary vertices, calculate the middle value of x, y, z for all selected points, not taking the boundary vertices into the account for the direction of the plane but projecting them onto the calculated plane as a boundary vertices only, create the planar shape in the calculated plane.