Troll picking

Hey guys, so I came across this idea.. What if you are playing a ranked game and let's say, you already called a lane for example - jungle. {{summoner:11}} And after your turn ends, it comes to another summoner and he picks jungle too. {{summoner:11}} Then you get duo jungle, thus a troll in your team. Wouldn't it be nice if Riot added a feature which will not allow this to happen? Let's say I'm trolling one of my teammates picked jungle, then I pick jungle but there comes the message: " Hey Summoner, your team already has a jungler! Pick another lane, good luck! Tell me what you guys think, -Judas _"Death is not the end of the journey, it is just the beginning..."_
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