It is completely possible, and no way to tell the difference between a legit DC and someone being a d**k. I myself gladly take the penalty, if I am to the point that I will quit, I need that timeout. I myself see no reason to try and cheat it.
I have turned my system off, forgetting that it didn't log me out, as I was thinking about something else, like my wife who was a week overdue on the baby, and started having contractions, which ended up being false. About 7 minutes later, I came back on, explained what happened, and were ok with it.
