QOS2 is the api name (header file is qos2.h) for the qWAVE networking technology.
You are correct that qWave is mostly targeted at multimedia applications. However it can also be used for different scenarios depending on what you're doing. The other new QOS feature in Vista is our enterprise QOS solution. There's a white paper about it at this URL on microsoft.com.
We'll be happy to help you select the best technical approach to your problem. Can you describe how you're using QOS and what you'd like it to do