Here is a hotfix item in patch 4.0.6 which I wish I knew about before Blizzard patched it…
“Engineering Target Dummies are no longer able to taunt boss-level creatures”
Tell me that could not have been exploited in a wonderful manner. Drop a few target dummies, and watch the Tank’s head explode (this is bad behaviour). Or drop a few when your Tank dies at 1% and hope the dummies absorb enough swings. Source. Just say’n.