I use GDG select pal but not sure if something else exists with more capabilities like select same gradient fill.
Not sure the need for a macro. When you select the Interactive Fill Tool there is a "copy fill" icon. You could either assign a keyboard shortcut to that or drag that icon to the top someplace.
no, that won't work. I need to quickly find and select all objects with a specific gradient.
*update, just realized I can just use Find Objects docker.