Lightbox Control

In the past with Storyline 2 I managed to remove the default red close button that appears on a lightbox by editing the player in the SDK.

Now with Storyline 360  I was hoping we would have a little more control over a lightbox, but there doesn't appear to be. Can these items be changed, or is there an SDK we can use:

1. Remove the default lightbox close button
2. Control the background transparency
3. Remove the dropshadow