Add an option in new track matte layer selection pulldown for "layer above".
Sometimes it is still necessary for every layer to have its own track matte and it would be quicker and easier to be able to select all of those layers at once and tell them to matte to the layer above them with one click. This used to be possible but appears to no longer be so in the new track matte UX. A seemingly obvious solution to this would be to add it as an option in the track matte layer pull down box (maybe at the top with "none" or something).
