I know on some servers they enable the use of emoticons in the chat (not those shitty default ones on cereal box, I mean steam emoticons), where your steam account connects to the server (if your profile isn't set to private) and lets you use the emoticons you own on steam in the chat. That would be cool and add variety. Dunno how it's done or how hard it is to code but it definitely is a positive perk to add to the server.