It is not possible for me to create a exploded/pie graph in a template with the options Legend and/or 3D View. I can see the legend and 3D View in the preview while creating the graph but a soon as I save and reopen the graph it has reseted the Legend and/or 3D View.

This is independent from whether the template is linked or not. Creating the graph with the exact same options and linked items for a host will react as expected and stay the way i have configured it. This makes the Pie graph useless as nobody knows how big the shares are.