Im posting this in-respone to the question @Chris asked in comments :
Suppose you want to create a launcher which will open "file manager(nautilus)" as root. Then you can do this:
Open terminal. Type:
sudo -H gedit /usr/share/applications/nautilus_root.desktop
Hit enter. When asked, enter your login password and hit enter. This will open gedit (text editor). Now, paste the following there:
Now, just save it and exit. You are done. Now if you search on dash then you will find a new launcher "Nautilus (Root)". Clicking this will ask you password, and upon authentication nautilus will be opened as root.
Note: Be careful when you are running "Nautilus (Root)". In this mode you can delete almost anything from
/ and break the system.