I have tried to find information on the web and haven't had a lot of luck, so I'm just going to tell you about our experiences and what we did. If you have any ideas or advice, please comment and share it with the rest of us.
One granddaughter, who was 28 weeks and weighed 2 lb 10 oz has had lots of temper tantrums and "melt downs". She is now seven, and is actually outgrowing some of it. We have had lots of talks about her behavior, and we have prayed over her and with her to ask Jesus to help her control her anger. That is what it boils down to sometimes is great anger. We make her go to her room and tell her to get herself under control. At first she ended up beating the walls or kicking them, and throwing things all over the room. So, we had to go upstairs and stop her from doing that. I had held her in my arms and kept her from hitting and kicking many times the same way you would restrain an autistic child. Thankfully, as she has gotten older and bigger, and I had trouble hanging on to her, she has also tried to control herself more.
I talk quietly to her, telling her to take a deep breath and calm herself. She will most often come across the bed to me, to hold her. She cries and tells me how upset she is. We pray together, breathe together (holding her to my chest and doing deep breathing--in through the mouth, out through the nose--helps her to regulate her own breathing. Eventually, the anger will pass and you wouldn't even know she had been that upset. I think that these children can learn to control themselves, as long as they know you will be there to help them.
I know that that works with the other granddaughter who exhibits symptoms of autism. However, she is older and gets more violent in her "trashing" around. I have to go to her and speak quietly, and sometimes just take her face in my hands to get her to focus. It is more difficult to handle her, but we work at it. She and the other granddaughter really have different issues, but the melt-downs are pretty much the same.
Anyone handle these things differently? I will continue to search for information on this issue.