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Best practice when more than one script needs to use the same parameters?
When one script set's the PREFERENCE to Company, is that the best way for the other scripts to access the same parameters?

That is how I have been doing it. I have seen others use a custom record

A custom record is more flexible, though a bit more complex.

If end users will set up the configuration, you can control the UI for a custom record form more easily and give it a dedicated place (whereas company script params are kinds shoved in with all the other company preferences)