War has minimal support for teleporting to warzones by walking on specifically named signs. This allows, for example, to set areas of 'featured' warzones or to be able to categorize them in your world.
When players walk into this sign they will be teleported to the warzone 'ziggy'.
War also supports creating signs to allow teleporting players to random warzones as well. This support can be used by creating signs similar to the above, replacing 'ziggy' with a $variable. Example:
This sign will teleport players to a random warzone on the server. Replace $random with $active to only teleport players to zones that contain other players.
Keep in mind the signs support is very minimalistic currently, and may be extended in the future.