This may be useful to others.
I was able to customise the Google API by adding/substituting some parameters:

echo "moolet_google_maps.setCenter(new GLatLng(-0.40, 34.67), 11);n";

the new GLatLng () function was substituted for (point) around line 131.


Because Google didn't recognise my "address" (point) , I had to manually find out what Lat/Long it was and convert it to decimal using:
http://andrew.hedges.name/experiments/convert_lat_long/

The "11" is the zoom level which I changed initially from "6")


I changed the "bubble" or "marker" to an address I wanted to display:
echo " marker.openInfoWindowHtml('My new addr, County, Country');

(around line 144)

Also have to change the new GMarker line (around line 137) from "point" to your new GLatLng (.....etc)


Hope this helps.
It seems to work OK!