Here. I have the Paint Bucket tool but when I press the Center Mouse Button and Shift, the cursor shows the switch to the Pan tool and I can pan the camera around the model space. It doesn’t return to the Paint Bucket until I let go of the buttons.
This applies to any other tool, too. If you have the Push/Pull tool or the Rectangle tool or whatever, holding the center mouse button will switch to Orbit and holding Shift with the center mouse button switches to Pan.