Excuse my ignorance.Somewhere is a default option,how to set it?Or the best polished way to do it?

If you use the
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:

Right click the file ------> Open -------> Edit as Root

Debian packages are
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- or
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& install via Synaptic.

I use gexec and check the tab as root. Open Geany or Leafpad. Open the file from there.

or like my terminal screenshot.

@tradetaxfree:I have not option 'open as..' in the filer.Not in Rox,neither in Nautilus or Thunar.
@Antix:also possible search and operate with files in a root terminal,but I have preferred less machinery to do,just in the
filer window.I know it's possible but it's a config file to edit,not at my level.
Actually I open with gksu the application to manage the file or the filer itself,it's useful to edit /home files from another distro to make an example.
It is just how to enable the above said"open as" option I would like to know,please.

Hi Rosa,

I have posted instructions
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for installing the qtFM File Manager & setting the Custom Actions so you can"Edit as Root" & also extract archives / open deb files with Gdebi.

For setting Custom Actions in Thunar see
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Thunar allows users to add custom actions to the file and folder context menus . You can setup new actions in the Custom Actions dialog, available via the Configure custom actions… item in the Edit menu.

Editing as root

Name: Edit as root
Command: gksu put-your-favourite-text-editor-here %f
File pattern: *
Appears if selection contains: Text files

Note: You'll need to replace put-your-favourite-text-editor-here with your favourite text editor (e.g. mousepad or geany).

spacefm is also a good alternative that has an edit as root option when you click on a file. (it is in the Open part).
Rox doesn't have this, though it can be set up. have a look here, on page 2 Open With


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&