Ok so im not very Techy but i have some ideas.
First I played a MMO that had a global "Game Chat" This was by far the best part of the game. You didnt have to talk or even have the window open but anyone in the world could talk. Usually the experienced players would be in there chating with each other and you could always ask questions and it would get answered pretty quickly
There of course were rules for this chat like Language and what not, Basic public etiquette.
This feature made the Community a very tight nit thing. anyone could talk on there and as long as you didnt act like a big noob then everyone had a good time and no one really ridiculed people for asking stupid questions.
And yes i know this isnt very realistic but neither is the ability to teleport to your hearthfire.
Another thing that i would like to see is that I hate when i am typing something out and then a message will pop up like a build screen or someone inviting you to their party and then your no longer in the message window and you are hitting all shorts of hotkeys. This is very annoying.
Just some food for thought.