Change arrowhead shape in Line Tool
I'm looking for a way to use the line tool but to change the shape of the arrowhead to be a circle (or large dot) instead of an arrow. If I change the Concavity of the arrowhead to -50%, the arrowhead looks less like an arrowhead and more like a dot, but I'm wondering if there is a way to change the arrowhead settings to be perfectly round (instead of triangular).

Current options for arrowheads.
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Desired look (except with the circle filled in)
Now, I know that i can just use the Custom Shape tool to draw that shape. However, I need to be able to change the angle or direction of the line when creating it. The Custom Shape tool only creates the shape facing the same direction every time, and then I would have to rotate that shape afterwards. I need to be able to click and hold to set the "arrowhead" and then drag the mouse away to draw the line and the direction of the line (just like the Line tool works).
Can the shape of the arrowhead be modified "behind the scenes" somehow? Can this same result be created with a brush tool or any other existing tool? Is there a way to set this up from a panel or any other way? Any help is greatly appreciated.
http://www.ianhoar.com/wp-content/uploads/2008/05/photoshop_arrows.gif
