The view of files and folders in the Web UI should load dynamically, not be paginated.
Currently, the default experience in the web UI is to paginate the view of files and folders, showing just 20 at a time. That's a pretty antiquated way of displaying a long list--most modern websites, including Box's competitors, just dynamically load more items as you scroll to the bottom of the page. I just finished helping one of our users who was very confused by this: he didn't notice the pagination buttons, and didn't understand where his file had disappeared to.
I completely agree - __please__ offer pagination options for the web UI (10, 25, 100, or dynamic like Ian suggested).