if I am not mistaken, ALL disconnects are treated the same - relaunching the game windows gives you the option to pick up where you were (alone) or exit the round all together. This isn't specific just to quitters, or to legit dropped rounds, it applies to all.
This is the major flaw in trying to penalize quitters, and why it will never work. Search the threads for others on the same topic, there are plenty of good suggestions floating around for how to handle this, none of which need to get rehashed her, in yet another thread.....