about champion select in rank, and intntionally feed

I pretty sure that most people play LOL for have fun, I agree with that, I enjoy every moment in this game. However, rank game is important for every player to show their ability and skills. But now it seems many people PRACTICE champions in rank game. They use new champions or some champion they never used before in rank game. That makes them feed their lane and sometimes they just quit the game leave 4 vs 5, oh, it may be 4 vs 6 because he already made the top so feed. Those kind of people bring me and other players nightmare, make people fury because the intentional feed ruin the whole game. Here is my suggestion: Players must use a champion met a certain number of appearances, then they can use the champion in rank game. Before a champion meet the requirement, players can only use the champion in ARAM, and normal game. In the rank game, these champions which failed meet the requirement will be atomatically banned by system. Therefore, players can no longer practice in rank game, and rank will be better for all players. on more thing, there are too many people ruin the game, and the punishment they have are just 5 mins delay, I think it's not enough. People who got report more than 3 times in ine game should not be allow join any game for one day, if it happens again, then the player can't join the game for a week. Because those people who feed, abuse, or refuse communication are really annoying.

Those are just suggestions, but I really hope ROIT can do something to punish those player who attack other, intentionally feed, or AFK. Anyway. merry christmas everyone ( and don't play LOL tonight, I lost five games already )