[aussieghump@mac.com]

Great idea...Bezier curves on lines would be great to make custom direction lines.

A new way of defining lines might be great as well....The ability to split a line into a number of 'sticky spots' for the insertion of arrows etc (ie intersections, 30 degree intersections etc) would alse be great.
The ability to add a crossover or inline graphic.

Maybe a function to change the line after it has been drawn (ie it become a shape with a number of invisible sides on a lower layer!) would get you down the the direction I am thinking!!