One Time Passwords
League has grow in size considerably over the past few years, it has over 27 million people playing a day. So I think it might be important to start implementing a one time password system.
If you don't know what that is, it is a program that randomly generates a password that you must put in when logging on. The next time you log in it will be different, so it is a pretty hard thing to hack as you not only need a player's username and password, but the program that creates the numbers for that specific account. I would recommend an optional app, similar to email verification, where players could choose them selves whether they want to use it or not.
I think this is rather important, because at this point many people have spent lots of time and money on the game, and getting hacked can be a real worry. That and it also feels good knowing your account is just about 100% secure. It also the game feel more official as many big companies also use this system for security (Blizzard, Steam, Squ-enix). I just think it would be a good addition to the game and those are my thoughts.