The .NET APIs divide configuration variable functionality between at least two classes: DgnPlatformNet::ConfigurationManager and MstnPlatformNet.Session.
We've written Viz Studio project ConfigurationManagerCombined that provides a façade for those two classes. We've added some other stuff that you may find useful when dealing with MicroStation configuration variables in your code.
There's also a demo project Configuration Mgr Example that provides a UI for ConfigurationManagerCombined...
You can download the Viz Studio solution, which includes both ConfigurationManagerCombined and Configuration Mgr Example.
Jon SummersLA Solutions