I replaced nautilus with nemo in Ubuntu 13.04 from these excellent instructions:
How to completely remove Unity, and replace it with Cinnamon?
However, I can't "open folder as root" from Nemo. Know what I can check? Everything else seems to work great.
Got closer, I installed gksu, and it prompted me for the password, however it wouldn't accept it and could not open. Seems like I'm missing something in my nemo install. Maybe I'll try reinstalling. ( did that, no change )
nemo seems to be using gksu, not gksudo ... I can simulate it from the command line. Not sure how to tell it to use gksudo instead for "open as root". Pretty sure that's the problem, as I can tell by the password dialog that gksu is being run instead of gksudo.