After much thinking we decided to make this a developer only feature. Mainly because it's pretty advanced and requires some extra work from the user side.
It's something we don't have the resources to support heavily. Meaning we can't answer everyone's emails and questions about how to create a multiplayer game.
By limiting it to developer uses only, we can provide the support needed to those (relatively) few users who are willing to commit that extra time and effort to actually make a multiplayer game.