Really to see the game script in this game? :)
Any parts of script
And really to turn on Debug Mode via script? (not in the General Settings)
The AGS code is compiled so while the game is running there's only binary code. It's not an interpreted language like html or javascript. So you cannot retrieve the script form anywhere in the run-time.
The only way to do that would be including the script files in the 'Compiled' folder and then read the text from those files with the File functions provided by AGS and show them in the game.
Didn't META by Radiant do that? I think when you quit the game it schrolled a huge screencap of the actual game's script.