Working with page #/page size vs index/offset

I'm wondering if anyone has been able to make this module work using page #/page size API calls? The API i'm plugging into requires these instead of index & offset. Calls when scrolling down are obvious & easy, but because of the way the buffer clears itself, I haven't found a way to make it work when scrolling up. Could the buffer functionality be changed to remove whole chunks instead of half?