Thunar has an option to add context menu custom actions to open Terminal, or to open folders and files in different applications.
Could it be possible to add a menu custom action that would open Thunar itself as root?
It appears that this is indeed possible. Following are specific instructions to add such an action, taken from this site.
Opening a root Thunar
Edit: fixed link
a dirty little trick i use because on my distro the "%f" will never be blatantly passed on to pkexe
create a newfile with the following
save it as: ~/suxe (note: some distros DO NOT like the ~/ shorthand for home folder access. So, use your actual path in this situation) e.g /home/Johnny/Documents/suxe
then make it an executable file in /usr/bin
make it executable
now in Thunars' custom action use:
Appears if selection contains:
hope this helps