Yes.
In the object dialogue for one of the playable classes in DWedit, double click on the list of ship names. Then when the new entity dialogue pops up, enter the name of the ship you want to add in the name line and make sure to select the ship class you want to create it as.
And you have it as an option to select in the game from the mission editor and the platform select dialogue when given open choice.
Enjoy!
Cheers,
David
PS Be sure to Save the database from the editor main menu before closing it.
