Some weeks ago, there was this guy in a ranked game who trolled since we were in champion selection
Never spoke during that time and when the match started he began turret diving since level one. Nobody dodged because there's a high time penalty (i've heard 30 minutes but for me it's 50, idkw)
So I was thinking about this and why not implement a system against trolls where you can vote to kick someone off the team during champion selection? That way, nobody's rate goes down and you can play unranked games with guys who DO want to play and will stop trolling the moment you enter champion selection yelling "mid" and locking immediately.
3 of the votes should be necesary to kick someone (can't count the vote of the one you want to kick) and if succesful, the 4 guys who were left rejoin the queue.
I'd believe this would make a better teamwork during games as you would be kicking the trolls/negative players