Got a request to add in dynamic icon support for markers, so now you can!
You now have the option to specify an expression to handle custom icons. You could either let it be a static image, =’http://localhost/QlikView/myicon.png’, or calculate the icon dynamically based on your data. If you do not specify an url the extension will default back to Googles standard marker.

Download link:

Here is an example where I plot high speed cameras in Sweden. If the speed limit is above 80 the icon will be a traffic sign otherwise it’s a beach flag, don’t ask me why…
The beach flag is loaded from an external url where the traffic sign is hosted through my QlikView installation. You could create something more creative – for example plot locations in red if there is X amount of critical support tickets open.