* **show_status_messages** - Whether to show only user joins/leaves and display name updates, or the full range of room status updates. Possible values are "never" (only the above), "moderators" (moderators will see all status updates) or "always" (everyone will see all status updates). Defaults to "always".
* **roomTypes** - Available room types. This affects what is shown on the /create route, as well as access to routes /createroom, /createchannel and /createfiledrop. It should be an array with possible values "group_chat", "channel" or "file_drop".
Defaults to all values, ["group_chat", "channel", "file_drop"].
Chat backgrounds can be set using the **chat_backgrounds** config value. It can be set per room type, "direct", "invite" and "public". If no background is set for the current room type, the app will also check if a default "all" value has any backgrounds specified.
Backgrounds are entered as an array. Which of the backgrounds in the array is used for a given room is calculated from the room ID, so that it is constant across the lifetime of the room.