After Effects CC 2017 (14.0) New Scripting Functionality

// Check the current tool, then set it to Unified Camera Tool (UCT).
{ 
    // Assume a composition is selected in the project.
    varcomp = app.project.activeItem;
    if (comp instanceof CompItem) {
        // Add a camera to the current comp. (Requirement for UCT.)
        varcameraLayer = comp.layers.addCamera("Test Camera", [comp.width/2, comp.height/2]);
        comp.openInViewer();

        // If the currently selected tool is not one of the camera tools, set it to UCT.
        if (( app.project.toolType != ToolType.Tool_CameraMaya) && 
            ( app.project.toolType != ToolType.Tool_CameraOrbit ) &&
            ( app.project.toolType != ToolType.Tool_CameraTrackXY) &&
            ( app.project.toolType != ToolType.Tool_CameraTrackZ))
                app.project.toolType = ToolType.Tool_CameraMaya;
    }
}

// Create a 360 VR comp from a footage item or comp selected in the Project panel.

varitem = app.project.activeItem;

if (item != null&& (item.typeName == "Footage" || item.typeName == "Composition")) {

    // Create a comp with the footage.
    varcomp = app.project.items.addComp(item.name, item.width, item.height, item.pixelAspect, item.duration, item.frameRate);
    varlayers = comp.layers;
    varfootageLayer = layers.add(item);

    //Apply the CC Environment effect and create a camera.
    vareffect = footageLayer.Effects.addProperty("CC Environment");
    varcamera = layers.addCamera("360 Camera", [item.width/2, item.height/2]);
    comp.openInViewer(); app.project.toolType = ToolType.Tool_CameraMaya;
}
else {
    alert("Select a single footage item or composition in the Project panel.");
}

// comp.markerProperty allows you add markers to a comp.
// It has the same functionality as layer.property("Marker")
{
    varcurrentProj = app.newProject();
    varcomp = currentProj.items.addComp("mycomp", 1920, 1080, 1.0, 5, 29.97);
    varsolidLayer = comp.layers.addSolid([1, 1, 1], "mylayer", 1920, 1080, 1.0);

    varcompMarker = new MarkerValue("This is a comp marker!");
    compMarker.duration = 1; compMarker.url = "http://www.adobe.com/aftereffects";

    varcompMarker2 = new MarkerValue("Another comp marker!");
    compMarker2.duration = 1;

    comp.markerProperty.setValueAtTime(1, compMarker)
    comp.markerProperty.setValueAtTime(3, compMarker2)
}

// Scripting support for Queue in AME.
// Requires Adobe Media Encoder 11.0.
{
    if (app.project.renderQueue.canQueueInAME == true)
    {
        // Send queued items to AME, but do not start rendering.
        app.project.renderQueue.queueInAME(false);
    }
    else {
        alert("There are no queued item in the Render Queue.");
    }
}

// app.availableGPUAccelTypes returns GPU acceleration types available on the current system.
// You can use this to check before setting the GPU acceleration type.
{
    varnewType = GpuAccelType.METAL;

    // Before trying to set, check which GPU acceleration types are available on the current system.
    varcanSet = false;
    varcurrentOptions = app.availableGPUAccelTypes;
    for (op in currentOptions) {
        if (currentOptions[op] == newType)
            canSet = true;
    }

    if (canSet) {
       // Set the GPU acceleration type.
        app.project.gpuAccelType = newType
    }
    else {
        alert("Metal is not available on this OS.");
    }
}