====No "new file" options on the right click inside a file manager====
it is simple.
just add a file named for example //New// inside your //~/Templates/// and the magic is done.
if you want a . doc file add a file Named New.doc using your doc software (ex. libreoffice)

====Double click on script to execute it====
from terminal launch following command
  gsettings set org.gnome.nautilus.preferences executable-text-activation 'launch'