I noticed there are layer functions listed that aren't in the manual but are in the program (tile_x, tile_y, tile_hspeed, and tile_vspeed, for example) but don't work yet it seems.
Which probably means its planned to have the ability to shift a whole layer of objects only moving objects in the chosen layer.
First use that comes to mind for that is maybe an endless runner. Just create an instance on a specific layer that already has an (h/v)speed and it'll move at that speed along with everything else on that layer.