How so? Not necessarily in multiplayer, it works also in freeroam, the more that one of your two ships is very slow, certainly enough to handle both in freeroam.
This feature is possible while the freeroam environments are mission xml files, edited and published by the mission editor. If you can create a simple mission, just adding bollards, tweaking weather and time, you just need to do the same by adding the player ships you need, e.g. FairmountSherpa modded and some Latitude,... they will also be equipped with deployable, etc. Bollards, player ships, are all the same.
Search for Freeroam.xml and you will find one in each of the environments, so that you can edit them at will, provided you keep a backup of the original file in case you want to use multiplayer later on.
You can share the environment with other players, of course, but don't forget to keep track of your changes, you can imagine why.
It goes without saying that the Freeroam.xml mission file should be saved or moved into the correct folder, for instance :
X:\...\Vstep\ShipSimExtremes\Projects\ShipSimExtremes\Data\Environments\Antarctic\FreeRoam.xml
The only difficulty is to be cautious and to find a way to backup and rename the files without delay, storing the environments in backup folders and not messing with them. Some specific folder out of the way...
Here the original Mvsmith's explanation, about bollards only:
http://forum.shipsim.com/index.php?topic=31880.msg406321#msg406321
and my remarks in this one (just translated) :
http://forum.shipsim.com/index.php?topic=29978.msg393022#msg393022
It is simple, easy, just try it !
Regards,
Luc