Two-fold suggestion:
1. Add grey line numbers on the left side of script windows that can be toggled.
2. Add a property of a script that includes display of the number of lines of code, and/or how big (in bytes) the script is..
From a developer perspective, this would help searching through long scripts and being aware of script size limits.
From a user perspective, I can get a snapshot of the complexity of scripts in items I have bought and am considering buying.