A new naval map called Boarding Action has just been finished for incorporation into the next version of War of 1812. It is just what it's title suggests, a map of two frigates side by side. There are ladders and planks positioned to allow movement between the ships and up in the rigging. The object in conquest mode would be to capture the other ship's flag. There will also likely be team deathmatch and battle game modes as well.
Doing a map with movable frigates supplied with cannon and crews can not be handled with the current game engine as the developers have pointed out so recreating a Constitution vs Guerriere type of sailing battle can not be done. However, there are maps in the current version that do use schooners and movable longboats such as Lake Borgne and Fort York that you may not be aware of yet.
As far as units are concerned, we will be adding a colonial marine to the British faction in the next version. This was a unit made up mostly of escaped slaves from coastal plantations. They were often used in raids during the Chesapeake campaign but will be available in both late and early war configurations. This unit will be uniformed in a white fatigue jacket with blue facings and will not have face customization. The rest of the uniform will be as the other British marines except they will not have a knapsack.