In the USD you can create Options that you can use within your Actions/Events/etc in the Unified Service Desk Configuration.

You can also access these values from within your own control via C# relatively easily.

To access the value within my USD Custom Hosted Control via C# all that is needed is the following code.

GetConfigurationValue("FoodforThought");

And now I can use this value within the USD without having to create my own configuration files et al in C#.