[Client] Invis Mode

I think it would be nice for League to have a feature like Skype has where you set your profile to "Invisible" while you're online so people cannot see that you're online. This would be useful for situations if you want to do a quick check on the store or masteries or something in the client but not be obligated to play with someone who sees you online and then have to explain why you won't play with them. Or maybe you are waiting for an IRL friend to hop online but again, do not want to be obligated to queue up with your online duo partner or whatever. The "Away" feature does not function properly because people still try to message you or expect you to play with them.

I think this feature could be useful to have for times when you don't want to explain your motives for not playing a game to any player on your friends list. Any other ideas for how this could be improved?