Just ensure that the untrusted dev user has no permissions to access the live file (ideally the whole live tree) and that's all you need.

Currently, the one other person who has access, has an FTP account that gives them access to 

/site/test/

[download]
so they don't have any access to the live branch.

My question was more about the methodology of defining the site-wide variables.
Is putting them in a module and declaring them with our a sensible way to do it?

In reply to Re^4: Holding site variables by Bod
in thread Holding site variables by Bod

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