We're not planning on supporting this during the beta phase, but we aim to make it possible some time after the stable multiplayer release.
BTW our own signalling server is running on a dedicated server with a gigabit connection, so you'd have to have a pretty serious server to beat that.
It's not about powers of the server. If the server is working only as signaling server, it doesn't need to be powerfull, it just needs to have good internet connection. The thing is that I would like to try to run signaling server and host of every room of my games in the VPS. Why? Because ping will be lower when you don't need to choose some random guy to be the host!