Hi again, and thanks for the quick reply last time.
I see it's not a bug. However, I would like to see additional labels to calss nodes become a feature, as it would make things easier with layering additional labels (at the moment extra shape nodes) and moving class nodes around. I like and use class nodes a lot, and this feature would make it perfect for my use cases.
As mentioned in my other question, additional labels can be added, but desn't get rendered. Let me know if it can become a reality or not.