Norman,
Your post makes GS mini function very clear. One more problem that I have seen and is more practical problem is when you are following a non-Airbus aircraft on approach. Although the same wind is experienced by both aircraft ( say CRJ/ERJ/Boeing and us sitting in the Bus) but preceding aircraft is not flying GS mini. The end result is the separation (between the two aircrafts) reduces and it can lead to a situation where you may have to go around or you'd have to fly selected speed that defeats the purpose of GS mini.
So in a situation like this what would you do?