An idea for handling abusive players
If we can get an API endpoint for blocking trolls/feeders/abusive users, and have Riot make it impossible to be matched with someone you've blocked, users can develop a crowdsourced block list.
I'd keep the project in Git, it'd be open source and transparent. It'd likely take the form of a web app.
Hit the app, login to it, and suddenly you've removed thousands of trolls from your pool of possible matches.
The best part for Riot would be that community maintainership of it means they don't have to do anything other than provide an API endpoint to handle blocking.