EDITED FOR CLARITY:
I have been working with scriptlinks, and I like the idea, a lot. However, I have one problem: If I make changes to the script, I need to reload it into the .blend file, or the file will simply use its the old, obsolete stored version of the script.
How do I make sure that when I have a scriptlink (Scene, OnLoad), it always uses the latest updated version of the script, rather than something obsolete stored within the .blend file itself?
EDIT: Problem solved!