Sometimes you just want to sign on and play a quick game. Maybe even experiment. If someone straight up quit a game, that game would show up in a list and you can just drop in with like a 10% IP boost. You are doing those players a service joining there leaver game. Of course this is in proportion to how much time you spent in the over all percentage of the game.
To resolve issues, you adapt the original players rune page and masteries.
I know Riot, you want people to buy champions in order to play them but this might be a fun innocent way to try them also while improving the quality of game for people that have lame leavers or internet problems.
A 2 minute disconnect gives your position to the queue. You also get a DC stat. This will show people how stable your internet is in future games.