So you are creating an Express VI.
In your custom configuration dialog, you want to have access to access the FileGlobals from TestStand. You can't just pass them in because the VI that is being configured is not running. I think I've got it.
I have never done anything like this, but I have built Express VIs and I have done a tiny bit of work with TestStand.
One thing to keep in mind is that the configuration VI is running, however. I know that you don't have live data on the reference, but maybe you can obtain it in the configuration VI somehow? If I get a chance, I'll play around with it.
I hope that this helps a little,
Bob