Loss prevented and leavers/afk

I was wondering what are the possibilities of Riot implementing a system that detects players being AFK or leaving for a longer period of time. In case a player rage quits or leaves a game because of personal or connectivity issues, the team doesn't suffer a loss of LP for a game they (in most cases) cannot win. It happened to me a bunch of times, when i simply lose a good game, just because we were one man shorter and the team fights were impossible to win.
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