One possible solution I can imagine is converting the Random “popup” into a toggled overlay, similar to the Coloring panel, which simply lists all the category buttons and then use the active/inactive states to toggle if you want that specific category randomized. To get this done is a few days of work, and in all honesty, I can’t recall anyone else wanted the Random button to function in a more advanced way in the past 7 years. 🙂 So while I’d be happy to do it just for you alone, I also need to be able to fit this into my priorities. As I currently don’t yet have an upcoming patch scheduled for ePic, I also can’t tell if/when this could make it into the software. If I could find the time to do it, and also have other things that’d support scheduling a patch, I’ll definitely look into it.
Whatever you can do, I appreciate it. I completely understand where you’re coming from.