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When a teammate picks a character in Champion selection, that character's portrait turns grey. I'd like it if you could double click on that grey portrait to send a message to chat: "So-and-so requests this character that emrot has chosen."
This would be a feature mostly targeted at low-end random play, when people aren't adept at playing multiple characters.
I personally have no problem changing characters, but nobody ever asks for it in chat, they just seem to leave the game. I'm hoping that this could help with that problem.