Icon zoom should also be done on desktop.  Currently, this is a problem
with SVG nautilus themes which have a large default size.  Currently, the
user has to resize the icons by hand to get it to a size appropriate to
their desktop size.  This gets problematic with icons like the CD which
only shows up when inserted or when you drag a new icon onto the desktop. 
The elegant solution is to apply the zoom control for the desktop portion.  

I"m not sure if this is a "nice to have" or a usability bug.  It isn't so
bad if it's just a regular png file.  But svg problems can be a problem
unless there is a solution I"ve overlooked.

sri