You're right, we provide no example of RTPC usage, but we are working on integrating an example in the Wwise Demo Scene in the future.
If you're fine with scripting, you should know that the AkSoundEngine class is simply a C# wrapper for the Wwise SDK, so you can refer to the SDK's documentation for more information. You can also look at the IntegrationDemo sample provided with the SDK for more examples.