if you come out of the instance at level 30, and decide to sign yourself back into the queue. Now, just go level up to or as high as you can get before the next server patch or before turning off your computer/logging out. You will stay in that queue and it should continue to put you in the same queues if you allow it to time-out. Haven't tested this to level 60, but it just worked on a level 51 Warrior in a 41-50