Yes, copy it to one or more layers at the same time. This would be most useful when copying pi characters or other geometric shapes that one wishes to include in all weights but there are no (or limited) weight changes to be made.
So perhaps instead of one single target layer, an option would be “All Layers”.
I hadn’t opened it in a long time, but it is not what it used to be, and it has already merged into Copy layer to layer. So I will remove it.
Best shot is to use Copy layer to layer with the Keep window open option, and then switch through all target masters, and click the button for each one.