ReportViewerBean window zoom options

We built a report viewer that uses ReportViewerBean to run reports that happen to have an automatic data refresh.  The report will be displayed on a fairly large wall monitor, so we're working on report-in-window sizing and other formatting.  We appear to need more zoom options than are in the viewer by default: 25, 50, 75, 100, 150, ..., Whole Page, and Page Width.  How can we add zoom options, for example, moving the scale by 5% instead of the default?   Or, to make the zoom option also a type-in field, where the user could enter something like 96%.

Thanks!