Riot Please change your punishments for leaving games!

As I am writing this, I had to leave a ranked game at roughly 5-7 minutes in to the game. I understand how leaving a game has punishments, but I never leave games unless something pressing comes up like in this case, so as far as I know my record is generally clean (the worst punishment I can remember is once I got a 5 game 20 min low priority queue). At the very least, all I am asking for is maybe something like if you leave during a game but your team wins as mine did, your lp stays the same or even you gain lp like the rest of my teammates did, in stead of losing it like I did in this case. Additionally, maybe there could be a system integrated that assesses your play during the time you were active, much like the experience ranking system works. In this game as jungle, my team had 10 kills at the time that I had to leave. 4 of these kills were by my hands, and a total of 6 of them I was apart of. I honestly feel that, though I had to leave, I made a large contribution to the game and did everything I could to assist my team, and was ultimately part of the reason why my team won and it, though I guess it is a policy, at this point feels very unfair to me and to other players who experience cases like this. I know I only lost 18 points and could easily gain them back in one game, but if you think about it that's essentially a waste of 15-40 minutes of my time that shouldn't have been lost. Just, in the future, I'd like to see a system that only punishes the leaving of toxic players and trollers, and especially not someone who couldn't help their leaving.