I don't think there's any need, like sheep we just follow what Dave does.
Baaaaah, baah.
I realize that I was potentially setting myself up for embarrassment if I'm missing something basic here. Although I use the Tracking Generator a lot and have never seen a use for storing the reference. Then also, you would think that Rigol must have had something in mind for it because it is listed in the User Guide as something that
can be done before Normalization(?).
And of course storing the reference can be, and is, very useful for many of the other SA measurements.
One thing that Dave doesn't do that I feel he should, is do a Normalize again after he changes the Start, Stop, or Span Frequencies.