Adding physical to generating layers

Hello,

since i haven't found a way to rename the layers i was using (Google maps normal, hybrid and physical), i found out i could add new layers with the titles i needed. Doing this, using version 6.x-2.x i couldn't find a way to add a physical layer.

found a solution editing includes/layer_types/google.inc, line 38.

function options_form() {
    $google_layer_types = array(
      'hybrid' => 'Hybrid',
      'normal' => 'Normal',
      'satellite' => 'Satellite',
        'physical' =>'Physical',
      'mapmaker-normal' => 'MapMaker Normal',
      'mapmaker-hybrid' => 'MapMaker Hybrid',
    );

quite easy. hope it saves time to someone.