Mass Source Modification in ggSap

Hi Jon

I am using your very helpful ggSap plugin for more than 1 year for my Ph.D thesis.

Now, I wonder to know is there any way to modify "mass source" for seismic analysis in ggSap?

I mean, Sap2000 would get mass from "element's mass and additional mass" for seismic and wind analysis by default;

Is there any way that we can add other loads patterns like "dead load" as the mass source in ggSap seismic load case? Or there is any way to define "Node mass" to include dead load for lateral load analysis?

Thank you in advance.