Script- you select multiple objects with path deform (or any other modifier) and you can change/animate every parameter in stack

Just like in the subject.

The objects are not instanced, but the script detects which of them have the same modifiers, and let you change all of their parameters at once.

It would be usefull when you have a spline, and many cylinders with path deform, you could edit the percentage values, or cylinders radius at once if you want to.