Actually if they join a premade party afterwards, the 30 minute penalty doesn't apply. If you are in a full group you can queue anyways even if one or more people have deserter.
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If they abandon the duty after the second boss they are not breaking any rule and therefore the Game Masters won't do anything. I reported someone a while back because I felt bad for the DPS that had probably waited 30 minutes for that run and the rep. told me that his punishment was basically the 30 minutes and that was it. Now, if they stand there and wait for you to kick them, then that can be reported, as some rep. posted in another thread.