The point being that what you see under the mouse is actually what you will go to when you click it. Currently it's anyone's guess where you will end up navigating to when you click the minimap in a large document, and the only way to see beyond the current view of the map is to actually scroll the entire document, which would not be necessary with my suggestion.
When the mouse moves off the minimap and you haven't clicked, it resets to its default position showing the current frame. If you have clicked, that will naturally be the new default view anyway, thanks to the mathematics of it. It makes perfect sense to me.
Customer support service by UserEcho