i suppose this is actually a scripting post, but all of the posts ive seen about this have been in level editing. anyway. there have been problems associated with the cameras in multiplayer mode, namely that they dont work for anyone other than the host of the game. the problem lies with the CameraTextureClient object, which doesnt send info over the net. the way around this is to make a new class of object that extends the CameraTextureClient.
class NetCameraTextureClient extends CameraTextureClient;
now use this object in your map instead of the CameraTextureClient, and anyone playing on your map will be able to use your cameras.