Yep, I agree. My kids are ages 6, 4, and 3 and they are NEVER unattended with Missy. We have several rules about "play time" with Missy. They aren't allowed to play tug, they aren't allowed to throw toys. They can't pick her up or carry her. They must sit with her on their laps and gentle play only. You have to be consistant, but they will get it.
I also think an ex-pen works wonders. It gives them a safe place to just be a puppy.