The chatroom is out for Blockland Glass, which makes up for the loss of RTB. However, I think more needs to be done for RTB to be completely replaced.
Basically, modify two existing add-ons to work for Blockland Glass.
1. Connect2Chat: would allow you to see chatroom dialogue in the client chat of a server. Hopefully that makes sense. A keybind would allow you to type a message that would be sent to the chatroom instead of the server chat.
2.
This: I didn't download it when it initially came out but it seems very useful.
I don't know how hard this is to do, but hopefully it can (will) be done.