line with arrow, not a leader

[t1.shep]

I want to create a line with an arrow at the end. Is this possible? I would like to be able to apply this to any line type. For instance, I want to show the accessible routes to the building or any other type of "path" with a dashed line with an arrow at the end, and I would like to be able to use any kind of line (straight, arc, spline, etc.)
Another method would be to use a leader line but have the ability to change the line type of the leader line from solid to another line type. Is this possible?

[dhurtubise]

Creating a line-based family so you can control both end and get the total length would be good for straight segment. Can't do curves for now
Typical line wont allow end control

[t1.shep]

I tried creating a line based family, but don't know how to add the arrowhead to the line and have it scale right.
Also, I only had a few line styles to choose from and no option to create new line styles.
So how do I create the arrow part?