yeah first of all the evaluation of this system is to force someone to do something. they need to go back to just banning people if you leave too many games. plain and simple.
if people rage quit the game that means they didn't want to play it, give them the penalty. people would be more likely to not follow through into a game if the leaver penalty wasn't a time constraint. you wouldn't see as many bad combinations since in retrospect they are bad in a personal opinion sometimes.
so to recap, if someone leaves before the loading screen then they lose rating and no one else loses rating. if they leave multiple in a row they lose recursively higher scores of rating. easy and simple. if you dodge too much then you have to never lose or you can't get rating with this method.
if the game starts and someone leaves before 5 min they lose the same rating as a que dodge and the game just ends. allies lose a reduced number if any rating. after 5 min the game is considered in progress and the team is now responsible for participation in the game thus everyone loses rating together.
the main proposal i am making as more of a direct solution to wasting additional time for people who DO NOT leave or rage quit. in comes the surrender evaluations. if you are not a support role and you are dying all over the place having a bad game, you cannot stop the people who aren't having a bad game from leaving since it should not be their problem if someone is having issues playing the game and can't compete.
in my opinion there is no reason a player who is 0-5 in 5 min of the game should be capable of stopping others from avoiding a 10-25 min time dump of their day.
i would also like to point out surrenders should NOT be under time constraints. making the whole community of players wait 15-20 min to leave if someone did really bad early makes this game out to be something that it isn't. that would be a job. this is a game, there is a difference and you aren't being locked in a room to exercise for the duration of what is expected in some military instillation style prison.