I saw someone on the community board ask if it was possible to use the click cube to create a perspective viewport. It is possible. There are a few steps involved in this:

1.  Use the Clip Cube to create a section viewport.
2.  Place the section viewport on a design layer.
3.  Use a camera to create the required perspective view.
4.  Create a viewport from this design layer in place of the standard viewport on a sheet layer.