Heh, and I've just done it again
Beta 22 adds optional wraparound scrolling (default is on, can be disabled in the settings). When enabled, both page scrolling arrows will be visible all the time as long as there is more than one page in the grid; scrolling before the first page will wrap to the last page, and scrolling after the last page will wrap to the first page.
Edit - there's a slight bug in that you can't wraparound scroll back to the first page using the d-pad if there are fewer than four icons in the row on the last page, because the selection indicator never gets to the far right column to allow wrapping. For now, please use the on-screen page buttons or L/R. I'll fix this at some point.