when the patch is released with the mission editor then you will be able to add places to tie up.
For now I had a few "missions" created that are really just free roam with multiple boats mooring places and no way points.
You can download these "missions" here (http://www.shipsim.com/ShipSimForum/index.php/topic,1834.0.html)
Regards,
Agent
P.S. 200th post