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I have an idea that may help with issues of ranked players auto-locking, demanding lane or feed, or just being AFK-locked into a champion and screwing the rest of the team. It's a rather simplistic idea, so I wouldn't be surprised if it's already been suggested.
Veto option during champion select.
This will cut back on people queue-dodging because they get stuck with a terrible team composition or are otherwise forced into a game that is a disaster from the beginning. We all know what I'm talking about. Having the option to vote on a match decline after champion select may eliminate a lot of losses and dreaded 30-minute waits because a "Teemo Mid or Feed" showed up.
So, with this option, there also comes the possibility of people just vetoing games against team comps they don't like. I don't really have a solution to this, maybe some sort of limit on the number of times you can veto between games, maybe a short timeout after multiple vetoes, or something along those lines.