Space filling overview mode requested

[mickmcq]

I would like to have an overview mode where the entire screen is filled with thumbnails. As it stands, I have to do a lot of scrolling during a presentation if someone in the audience wants to look at a particular slide. Other slideware usually has a "slide-sorter-tray" view that starts out by showing all slides in a space filling grid. As a bonus, there is often a zoom option allowing more detail to be shown on each slide, at the expense of some scrolling. Is this possible, or is there some way to code a workaround for this?