When you get a message on a server in channel chat, it would be helpful to see which server the message was written on. Otherwise you have to click through the servers one by one.
The red dot at the channel chat could also be taken over at the server icon or similar.
With TS5 server channel chats will no longer exist in their old form.
They get replaced with rooms and these rooms got their notification per server. like your “Talk -1-” notification below the server.
I think it is not worth the time to add a feature for something that will be replaced soonish.