P: When selecting a collapsed stack, provide option to apply changes to all photos in the stack

In Lightroom 5.4, if I select a collapsed stack of photos in the Library module, I would like the option to automatically apply changes (e.g. metadata) to all photos within that stack.

Background: as a first-time Lightroom user, I used the auto-stacking feature so that my 3-shot bracketed (i.e. HDR) photos would be stacked together. With the stacks collapsed, I went through my library, selected multiple stacks, and typed in a GPS location to be applied to those photos. I assumed that by selecting the (collapsed) stacks, the metadata would be applied to all photos within those stacks. However, the GPS locations were only applied to the first photo within each stack.

After the fact, I learned that stacks must be expanded in order to select all photos within the stack. From my perspective, this defeats the purpose of creating stacks - if one must expand the stack to apply changes to all photos within the stack, there doesn't seem to be much point of creating stacks in the first place.