Thank to you all for your replays!!
YES, it would be a very nice feature for the next upgrade.
I think it is almost implemented, its just like towing from that point of the ship to the other point in the land. The vector forces are the same like towing from another ship.
Actually we could use another ships to push from the other side and make the vessel come closer to the bollard. But, I dont know if it is possible to have more than one crontrollable vessel at the same time in singleplayer mode.
Any way, thanks very much. Cant wait to download the new addon right now!!