Ever since patch 1.2, I've started getting Blue Screens while playing the game (Don't worry, I'm not complaining about that, something is wrong with my hardware and I know it). However, I was queuing Rankeds with a group, and I Blue-screened right at the beginning, which means I then screwed my teammates out of a player for the entirety of the game. With Rankeds, I think if someone DCs, then "Queuing for Rankeds" should place the DC'd player back into the warzone, since he was there to begin with, or he's with the group.
A way to stop cheating in that sense is to make it so that the server takes a list of players in the Op, that way nobody can switch in and out. Just an added thought.