Soon, I am totally behind you in your fight against ragequitters.
If you read my post, [on the thread for d/c'ing] you will see.
I have a very short time, I'll message you later about more.
I think that one solution is that the person who received the D/C (the one who was most likely about to win the match) SHOULD get a win, and a boost to their ranking, whereas the person who D/C'ed should not get any boost at all, but no penalty.
I don't know much about programming, but I think that this would be an important first step, as the person still connected to the server IS still connected and can and should receive an increase in rating.
I have no more time, I'll add more later!