I searched for it, but didn't find anything, so here we go.
Something I personally liked in gmod, was servers with chat mods allowing smileys/emoticons in chat.
I really hope for something like this to be implemented in TU. It could have a small icon below the chat with a pop-up function as well, showing all the smileys and shortcuts to type them in the chat. Could use the ones we have on the forums because they are neat and cute.