As this plugin is Open Source Software, you could by editing the source files directly – but I strongly encourage you not to do so, as this opposes at least the license conditions of used maps from OpenStreetMap, MapQuest and OGD Vienna.
I also ask you not to remove the link to MapsMarker.com as this plugin can be used for free and a higher publicity helps building up a user base for the plugin and encourages the plugin´s author to continue developing new features
Posted in: Usage