...
You can use each element of a Metadata Set within a Naming Preset. In the example above this would be "quality", "customText" and "special". Open the Just Control Configuration Panel and switch to the “Naming Presets Presets” Tab. Create a new Preset and instead of using "%" + the variable name, you can use "!" + the variable name, as shown below.
...
Now switch back to just:control Just Control and select the new Naming Preset and adjust the Metadata Set values. The Naming Presets variables will get changed accordingly.
...
This is a very easy and straightforward way to handle the file naming with Metadata Set values.