The ability to have an in-game status would be cool, because not every one in the server is on your friends list and stuff like that it would be cool if you could set your status as away on steam, and in game it will say that you are away.
Also lets say you just made a community and you want more people to join your group having the server send invites to people would be awesome.
I do believe that the module is needed on a client as well as the server, so that is where there is a little bit of a problem.