You would need a view with scrolling, I would say. Today, there isn't much choice: only Carroussel achieves such thing. However it may be that it is not enough.
If you choose a "SlideShow" view, you may have a better icon size, but still it will be tiny. Here I think a scrollable Slide view would be very nice... Or maybe something else ?...
Subscription date :30 November 2007 Messages :17118
with the "Slide" view you can cover almost all your desktop
I wonder how many icons you have, but if it's too much even for this view, it's maybe that you should make another sub-dock
(for instance, you can instanciate Stack or Shortcuts 2 times)
Anyway I agree for a scrollable Slide view, or better