TDR,
Seems you can't anymore. Have not found a workaround yet.

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Luc Sanders
MVP - PowerPoint
> In 2003 PowerPoint I could edit points on a straight line segment to draw
> whatever I wanted. How can I do this in 2007 PowerPoint?
Not anymore, unless you are using freeform tool to draw the straight line
instead.

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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Oct 20, 2007
(Amazing PowerPoint animations, artworks, games here)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate
> In 2003 PowerPoint I could edit points on a straight line segment to draw
> whatever I wanted. How can I do this in 2007 PowerPoint?