XML Google Maps: How to set focus of “my maps”

First of all: Thank you very much for giving us this great plugin, Patrick Matusz!

I want to add “my map” from Google Maps and used the “Google Earth-Link” to do that. But I didn’t find out how to set the focus of the map: In Google Maps you can adjust the image section (Bildausschnitt) exactly (via “Link”->”Eingebettete Karte anpassen und Vorschau anzeigen” (in the german version, of course)) so the focus and zoom is not oriented on the markers on the map but could be set manually. I tried to integrate the coordinates of latitude and longitude displayed there in the link to “my map” but didn’t get it working.
Using the whole embed code from Google Maps works, but I’d like to use the plugin’s advantages, of course.
I couldn’t find a solution on the well done plugin-page but maybe anybody can help me with this? I’d like to show a map of iceland, that’s why it is important for me to be able to set the focus exactly ??