I have write a new patch for nautilus 3.4.2 (Ubuntu 12.04).
This patch had the Up button and a toogle button for the location bar.
The shortcut <control>L is replaced by F12 and work in toggle mode

Instructions:

Make a new directory to work in, then download the nautilus source code and dependencies:

Code:

 mkdir nautilus-mod
 cd nautilus-mod
 apt-get source nautilus
 sudo apt-get build-dep nautilus


Then go to the nautilus source directory:

cd nautilus-3.4.2

and move the nautilus-toolbar-patch.txt file to the source directory

Code:

mv [location of patch] .

Patch the source code:

Code:

patch -p1 < nautilus-toolbar-patch.txt

If the patch is successful, build nautilus

Code:

./configure --prefix=/usr
make

Kill any running nautilus process, then install system-wide:

Code:

sudo killall -KILL nautilus
sudo make install
nautilus -q


If you want nautilus back to its original state, do "sudo make uninstall" and reinstall nautilus with this command:
Code:
sudo apt-get install --reinstall nautilus