Please understand that I'm pretty Windows-ignorant. If I understand what you've said, the structure is the same, but the tool isn't included. (I was afraid maybe the technique for running shutdown scripts had also changed.) So the Home edition provides no tool for incorporating shutdown scripts? I don't think I should try the regedit solution withing seeing EXACTLY what I need to change.
BTW, I don't understand the reference to the Solarwinds WMI Monitor at all. Does it include a group policy editor?