Displaying wallpapers in /usr/share/backgrounds/ in settings

[Petko Ditchev <pditchev gmail com>]

Hello, I want to ask if there's a way (dconf setting or whatever else) 
to make the wallpaper chooser display non-GNOME wallpapers that are in 
the backgrounds directory? And as a side question - why restrict to 
those in the first place ?!

Petko