I see the point in the workflow you describe.
Have you tried selecting the tracks you want to change parameters on and (on Windows) simply hold shift+alt then change value? That should work for values that toggle on/off. For changing something like faders to a specific value really what Nuendo needs is a grouping and VCA system that’s at least like the one Pro Tools had like a decade ago. That’d be two solutions to what you’re suggesting.
But I still agree that what you’re proposing could be easier.