Ah, yeah I changed it from !play to !start because I noticed some chat bots already had a command for !play. Forgot to change it in the changelog it seems.
But what exactly does your stream configuration look like, in other words, why would you prefer a command over clicking the start button manually? I mean ideally you only need to do this once per stream?
But anyway, I could implement it in the way you are describing but it would be a little more complicated since the game doesn't actually connect to your chat until the start button is pressed.
Perhaps an automatic start would also work for your needs?