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How about a system to rate our lane performance before joining solo/duo que?
Ex. Jungle/mid/top/sup/adc best-worst.
Or even make it a requirement that you rate your lanes before being able to que. This allows other players to see what you are more comfortable playing and may keep you from getting adc when that is your worst role. Granted you may have to play your worst role but it is the most courteous thing that can be said at the beginning of any champ select.
I have used this method myself to get favorable positions and even have others in the select join in.