How can I install a custom emblem for my extension?

[Boyd Timothy <boyd timothy ws>]

Thanks to Dave Camp's nautilus-vcs project as the reference, I've  
started working on a nautilus-ifolder extension that will eventually  
make calls to iFolder's Web Service using gsoap.  I'm wondering,  
however, how to install a custom emblem to show whether a particular  
folder is an iFolder.  I can place my ifolder-emblem.png file in  
$HOME/.icons/gnome/48x48/emblems/ but then that only works for the one  
user.  Unless I write some other code which does a check at extension  
startup time and does the copy, is there any other way to install a  
custom emblem?
I see that there's a private function  
nautilus_emblem_install_custom_emblem() defined in  
nautilus-emblem-utils.c.  Could that function be exposed in the  
extension API?
For anyone who's interested in the code for nautilus-ifolder, it's  
checked in under the "ifolder" project on http://forge.novell.com/
Here's a direct link into the nautilus-ifolder module:  
http://forge.novell.com/modules/xfmod/cvs/cvsbrowse.php/ifolder/ 
nautilus-ifolder/
-Boyd