So there's this button in the top right corner of the chat that opens an external chat window. That window however does not work at all, it doesn't show incoming messages, you can't switch the chat tabs you see or which ones you talk in. It also doesn't look very good, looks like it was just thrown in there and never completed (surprising?).
I'd use it to chat chat easier for example while farming my productions and doing something else on the computer. It'd be pretty nice to have a smaller window that I could easily determine the position of on my screen while doing projects or watching something. Some Players running the game windowed would probably also find it useful for reducing the user interface size but not missing out on the chat.
So I propose making the external chat window actually work, adding all the missing functionality, and then possibly improving its look