LC for clarification. The displacement appears to only be global so u can use domains, but it will apply to the whole object. The only way around that I know is w/ a uv map where u decide what gets displacement. I would think easy to fix, but it should support domains. Remember anybody can go suggest things for c6 in the bug tracker. They actually read them and follow up.

No need to think outside the box....
    Just make it invisible.