I have to admit that I too am a bit confused by the Scripting option in Picard. The scripting language is easy enough, but the handling of the script(s) is where I'm not clear.
When I check the box to enable script(s), I can enter a title and a script. If I click the button to enter a new script, the title changes and the script box clears. What happened to the script that was there before? Is it saved? If so, how do I edit or disable it? How do I enter multiple scripts? What if I have 4 different scripts and I want to disable one temporarily?
Writing the scripts is the easy part. Managing them in Picard, now that's a challenge.