Great, very useful, feature! (Page Layers)

Some minor suggestions for possible improvements in the future:

It does not appear that you can preview a page layer. That would be helpful when laying it out. (Though I guess it is pretty much WYSIWYG already.)

When putting a text object on the layer, you do not have access to the justification. I think that would also be very helpful. When laying out columns, I'd like to make the label text object the same width as the column and then have the text center in that width.