Surely you could get away with making a custom part in Eagle (extremely easy to do, takes no more then 5 minutes
) having pads in the pattern wanted, then placing this component on the board edge? This would be the easiest way, as you then have a part where you can wire to easily.
Alternately, draw the copper trace at the required size to the edge as needed, then draw a polygon over where you want the connectors using the 'tstop' and 'bstop' layers, which will tell the fab house to not mask that copper.
If you are still really struggling, send me a PM with the connector that you are trying to use and I can whip something up for you.
-kizzap
Edit: Also if you weren't aware, there is a dedicated Eagle sub forum here, although it is rather quiet.