Using a Modified Schiff Median Line
Special thanks to Todd for submitting this tip.
To create a modified Schiff median line right click on the pitchfork button on the drawing tools toolbar to bring up the Pitchfork Properties window.
Left click on the "Modified" button at the bottom left. The button should now appear in the 'depressed' state. Click OK. This will activate the modified Schiff option for the next time you draw a pitchfork.
Your pitchforks will now be drawn in as modified Schiff median lines until you de-select the Modified button in the Pitchfork properties window.