Champ Select Dodge Vote
Personally, I think Riot could have a very easy way to avoid toxicity if they would put a way to call for a vote to dodge if your team has a very toxic person in champ select chat or they're holding the lobby hostage. I get so many people that get a role they don't want and instead of taking one for the team and dodging, they decide to hold the team hostage in champ select by deliberately picking a champ that does not fit the role they were given and then trolling and feeding the entire game which wastes everyone's time and also tilts people. If they could introduce a dodge vote in champ select, and the vote gets 4 yes votes, then they could push everyone in that team out of the champ select back to the lobby and make them restart queue times however they would not have to lose lp. I know this wouldn't stop all trolling, but it could at least help in a major way.
These are just my thoughts on a way to decrease toxicity. What are your thoughts?