This simple example script turns off accept lights and shadows for selected layers (it assumes those properties haven't been keyframed):

{
  var myLayers = app.project.activeItem.selectedLayers;
  for (var i = 0; i < myLayers.length; i++){
    myLayers[i].acceptsShadows.setValue(false);
    myLayers[i].acceptsLights.setValue(false);
  }
}

Dan

Something like this should get you headed in the right direction:

{

  function shadowsOn(){
    var myLayers = app.project.activeItem.selectedLayers;
    for (var i = 0; i < myLayers.length; i++){
      myLayers[i].acceptsShadows.setValue(true);
    }
  }

  function shadowsOff(){
    var myLayers = app.project.activeItem.selectedLayers;
    for (var i = 0; i < myLayers.length; i++){
      myLayers[i].acceptsShadows.setValue(false);
    }
  }

  function lightsOn(){
    var myLayers = app.project.activeItem.selectedLayers;
    for (var i = 0; i < myLayers.length; i++){
      myLayers[i].acceptsLights.setValue(true);
    }
  }

  function lightsOff(){
    var myLayers = app.project.activeItem.selectedLayers;
    for (var i = 0; i < myLayers.length; i++){
      myLayers[i].acceptsLights.setValue(false);
    }

  }

  function createUI(thisObj) {
    var myPanel = (thisObj instanceof Panel) ? thisObj : new Window("palette", "My Tools", [100, 100, 300, 300]);
    myPanel.shadowsOnBtn = myPanel.add("button", [10, 10, 150, 30], "Accept Shadows on");
    myPanel.shadowsOffBtn = myPanel.add("button", [10, 50, 150, 70], "Accept Shadows off");
    myPanel.lightsOnBtn = myPanel.add("button", [10, 90, 150, 110], "Accept Lights on");
    myPanel.lightsOffBtn = myPanel.add("button", [10, 130, 150, 150], "Accept Lights off");
    myPanel.shadowsOnBtn.onClick = shadowsOn;
    myPanel.shadowsOffBtn.onClick = shadowsOff;
    myPanel.lightsOnBtn.onClick = lightsOn;
    myPanel.lightsOffBtn.onClick = lightsOff;
    return myPanel;
  }

  var myToolsPanel = createUI(this);
  myToolsPanel.show();

}

Dan

When you guys are done with this, please post it on AE Enhancers or AE Scripts!