Easy quality of life changes that should have been fixed years ago.
First, the system shouldn't act like I'm rage-quitting from a game when the patch hits. The whole, "Your team needs you, are you sure you want to quit" message is completely irrelevant when it's the system and server making me quit. Furthermore, why not just have it boot you from the game, instead of lagging you insanely and acting like you're DC'ing?
Second, people don't always respond to the "game found" prompt when they're waiting in the queue. Why are we forcefully exited from windows (item sets, the store, hextech crafting, etc.) when the prompt fails? It pops up, I click it, then it goes away, and I'm back at the front page again. Why? Obviously I wasn't doing anything too important, but maybe I was trying to be productive with the downtime, working on an item set or mastery page, or figuring out how much more IP I'd need to finish my latest rune page.
Third, there should be an option to passively opt out of the LCS / Pro-level prompts. There's an option to not have to look at newbie tips more than once; why not implement the same function for competitive games? I'm here to play; if I wanted to watch someone else play, I'd be on Twitch.
Fourth, there should be an option to message people who aren't on your friends list. I got DC'd from a game, and then coudn't re-join after I logged back in. It was showing a loss, but my team had been winning. I had to befriend one of the players from that game to figure out what had happened.
Fifth, you should be able to view your equipped runes and masteries while in a game. Runes that scale with level often make it difficult to calculate how much more CDR you need to build, especially if you forget which rune page you're using.
Sixth, we need to be able to mute/disable pings. It's a common form of harassment, and it's very annoying. At least let us limit the number of pings we can receive from a single person in a short amount of time.
And lastly, there should be some indication of why you got the rank you received with a champion. I've seen people go 12/2 and get a lower score than someone who went 6/8. It's obviously not based on KDR, so what in the heck IS it based on?