My three friends and I (a full group of 4) queued into Leveling Roulette today, but forgot to check the limited button. Instead of vote abandoning, I left, so we could re-queue and I incurred a 30 minute penalty.
When you queue into other things as a 4 man party, you do not incur a penalty. The penalty should be removed from leveling roulette when queued as a full party so that it is consistent with the rest of the game. Especially since it now has an option that modifies its behavior that can accidentally be left off.