you cam simply just que as you normally would, 1 tank, 1 healer and 2 dps. nothing is stopping you from changing your job once inside the dungeon, go ahead switch the healer to dps and off heals, amd what you are asking for, is what you get. Another thing, a "support" job would most likely fall under the category of DpS, so if you had a buffer, they would still be a dmg dealer, so whats your problem with support roles? we have a bard, arent they buffers that dps?