Add "run in terminal" option in Nautilus actions configuration tool

In nautilus-actions tool, go to Edit > Preferences > Runtime Execution. In the "command pattern" field, enter: gnome-terminal -x sh -c COMMAND

Then your commands/scripts will execute in the terminal just fine. Hope this helps someone!

Add a new action in Nautilus Actions Configuration Tool, called "Run in Terminal".

The relevant command is simple:

gnome-terminal -x %f

So, add that under Command tab

To always keep the terminal open when running this action, use a Gnome Terminal profile with that setting: In gnome-terminal, Edit-Preferences, select 'Profiles' tab, add new profile and call it "hold", and under 'Command' tab check to keep it open:

then add --profile=hold to the gnome-terminal parameters

(On how to add that setting in other terminal emulators, see THIS answer.)

Then, under Mimetypes tab, add application/*.

Be sure that under the 'Action' tab of Nautilus Actions Configuration Tool, you have selected the setting for displaying the option in context menu of selection.

Save.