Hi Maverick:

Not sure Google Maps API provides for this but asking anyway.  Have seen a KML file with icon style customized which I found very useful.  The format is something like this:

<Style id="label_x">
<LabelStyle>
<scale>0</scale>
</LabelStyle>
<IconStyle>
<scale>1.0</scale>
<Icon>
<href>http://website.com/path/file.png</href>
</Icon>
</IconStyle>
</Style>

Just asking if that functionality could be possible in GPSTools.  If you need a link for reference let me know.  

Regards!

Edfel