JustCode provides warnings for unused private methods too. Providing warnings for unused public / internal / protected methods and classes is on our TODO list, even though it will take some time as we'll need to do some additional global analysis and we'll also need to know which are the "root" projects.
As for the StyleCop integration, unfortunately we won't be ready with it for the Q1 release but we're working on it. In the latest build for example we introduced code ordering as part of the C# formatter which covers one more category of the StyleCop rules.
the Telerik team