Eyedropper for the bones, not the armature - or for both.

There are some places in blender where you can specify an armature (e.g. in the armature modifier) with an eyedropper. But most of the time the list is rather short, compared to the next list, that lets you specify which bone you mean specifically, which tends to be rather long. But this list has no eyedropper. Can this UI behavior be changed, or is this a known issue?