Transparency / Opacity Mask - In layers pallet page item names look different with masks (underline) and opacity masks (dashed). It would be great if you could add this to properties of the page item like mask: none, opacity mask or mask. Identifying these objects is even harder then Envelopes which can only be identified by identifying as plugin object. Worst case putting info in the tag propery would be better then nothing when cresating it. I do not believe a opacity mask can be identified through any form of SDK/Script which makes identifying raster images in the file impossible. The other option would be to have the raster item still listed when it is part of opacity mask. Also on this site an option should be all so that not SDK/Script specific.