Comment 2 for bug 590216

The best solution would be to implement policykit in gio/gvfs, because that would affect so many more applications than just nautilus-elementary. If you save/edit a file with gedit, inkscape, gimp or abiword etc. in a folder where you don't have permission, it would just ask for a password when needed.

Bug related: https://bugzilla.gnome.org/show_bug.cgi?id=561443
Brainstorm idea related: http://brainstorm.ubuntu.com/idea/22830/

Notice that Mac OS X does this, and there is a reason behind this. My friend stopped using Ubuntu partly because of this, he thought it was to much struggle doing simple things in Ubuntu.