I thought it was perhaps impossible but since the new Launcher
does it, it obviously can be done. (Note that Launcher has scrolling down in some of their information tabs so the scrolling aspect of PocketDay shouldn't be an issue for a homescreen.)
Think of it: install a "PocketDay Homescreen" app over Zen (just as you can with Launcher). Have the drop down menu for applications that don't have shortcuts. It's the Holy Grail.