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I was thinking about some sort of current status feature.
When your friends are online and their are in-game, you got some kind of info about which hero he/she is playing. Maybe this can be more advanced I was thinking, like with who is he playing and against who. Something like the final overview you get when the match is finished. I don't know if your getting the point but that should be a great new feature.
It shows you which of your friends is playing together against which team and what summoners they are using. This should give you a much better overview.
Please give me your thoughts.