Why isn't there a "Managed File Reference" parameter?

[David Karr]

I really don't like how I have to provide the Maven "settings.xml" file to my build job.  I know I can override the default GUID value, but the whole mechanism just seems odd.

What I would LIKE to see is exactly how a "Credential Parameter" works.  In the job configuration, I just specify the principal I want, and my script receives it as an opaque value that doesn't need to be hardcoded anywhere. I'd like to be able to provide a "File ID parameter" the same way, just selecting the managed file from a dropdown, so nothing needs to care about what the actual value is.  Scripts should never have to have GUID values hardcoded, or values substituted for GUID values.

I know there is a "File Parameter", but that seems to be something different.  I'm not even sure what that does.