I think there should be a new feature, not personally though.
Okay, so the point of this forum is about for all of those who have issues with playing League of Legends (being not able to continue the game due to several reasons). I've met many people online who had to afk for a long time, or even quit because "they had to go". Which most likely, states the fact that they're not allowed to play at THAT time. IF you're not allowed to play at all, don't even start a game. Eh? Where was I? Oh yes, I have two alike features that might be able to solve that problem. http://www.thehomeplanet.org/wp-content/uploads/2011/10/Or-not.gif
Feature 1: A new system that would let other players queue for other players in game that are requesting for a takeover. After that, if they both agree to it, then the player that queued would be in the game. Summoner name and all. BUT, the player who queues for it will be allowed to edit masteries for 20 seconds. Meanwhile the other person is possibly busy. It's a win-win.... right?
Feature 2: Basically the same but a bit harsh. Same thing as above but the person who queues has to switch without choosing yes or no.