Script preference management

I am using a custom Bridge script to manage stacks. The script requires a value that changes depending on the user workflow. At the moment, the user must hardcode the value in the script.

What are the choices to simplify the task of opening the script and assigning the value to a variable?

Ideally, the script would be listed in the preference panel where the user inputs the value.

The script is available as a menu item in the menu bar.