What I've found is that everything listed in the "General Items" list in the Customize Home menu are the pre-assigned or hard-coded functions that are automatic on VSP Settings.
In my case, those Home Screen words are "Filter Pump", "Spa", "Spillover", "Pool Heat", and "Spa Heat." I don't think the labeled word is the secret, but just the fact that the function is in the list. I can even change what those 5 functions are called on the VSP Setup screen via "Speed Label", though it doesn't change their original name on the Home Screen.
You can check this by clicking on Temp1 on your list and choosing another label. Functionally, it should still control what you know as Temp1. But whatever it is called on the Home Screen won't change. Does that make sense?