Generally show_from+show_total are used to split data over multiple pages. As such it's seems logical to support this natively. If show_page is set it should be used to calculate show_from (show_page * show_total) prior to getting the data (and thus overwriting the set show_from). When the data is gathered and show_count is set this value should be used to calculate show_pages ( ceil ( show_count / show_total)).