Do you have a link where we can see this occurring? It will help us to understand what might be going on.
As for the info window you can comment out the line of code that makes it open by default, in the google_javascript folder in the wagmp_map_1.php file you can look for the lines like this:
if('address_0_<?php echo $Recordset1_id; ?>' == 'address_0_0')
marker_0_<?php echo $Recordset1_id; ?>.openInfoWindowHtml(address_0_<?php echo $Recordset1_id; ?>.infowindowtext);
}
You can just comment out the marker_0_ line like this:
if('address_0_<?php echo $Recordset1_id; ?>' == 'address_0_0')
/*marker_0_<?php echo $Recordset1_id; ?>.openInfoWindowHtml(address_0_<?php echo $Recordset1_id; ?>.infowindowtext);*/
}
If you have trouble with this post back with the file and I can show you want part to comment out.
As for the zoom level you can adjust that in the code, look for this setting:
map.setCenter(point, 13);
The 13 is the zoom level, the lower the number the larger the area you will see when the map loads.