Hey, thanks a lot for your feedback!
Unfortunately there won't be any add-ons, since CBS 2 is based on a system closed for any developers outside of TML. TML themselves will most likely also not develop any add-ons due to new future projects already in the pipeline. [Blocked Image: http://www.tml-edition.com/file/pic/emoticon/default/smile.png]
Multiplayer is basically the same story: TML themselves would have to develop this and there just isn't any time or the necessary budget for the development.