How can I apply a pressure load on multiple connected surfaces?

When working with the Pressure Tool a pressure load is automatically created as soon as a face is selected. To create only one load the following selection methods can be carried out:

The “control key” (strg) can be used to select multiple faces with the curser at once and create one pressure load on the selected faces.
When the adjacent faces to one face should be selected, the “alt” key and a double click with the left mouse button can be performed.
When there are a lot of faces in different directions they can be hard to select while pressing the control key. In this case all other faces, that don’t experience a pressure load, can be hidden. By drawing a window including all the visible faces the pressure load will be applied as one load to all of these faces. This is shown in the picture below.