I would like the ability to add mutlitple guilds to my guild chat. Specifically, we offer several playstyles (roleplaying, permadeath and powerlevelling) as seperate guilds from our main guild. We did this so we could offer these things to people outside our guild without making them join the main guild. It would be nice if we could combine all of the guild chats so everyone can talk to each other.

Even prior to setting things up, I wanted to see this, so the new guilds that are starting up or larger guilds we are allied with would all be able to talk in the same chat.