You can't add a Boo Project to an Cloud (Azure) project as a worker role. When you try, you get this message:
Unable to cast object of type 'Microsoft.VisualStudio.Project.ReferenceContainerNode' to type 'Microsoft.VisualStudio.Project.IReferenceContainer'.
I have tried manually editing the .ccproj, but VS removes the Boo Project after I load it.