I don't know if is it the right section to ask about Karma, anyway…
I have few questions:

1-) How do I set the tessellation level for a displacement, I can't see any option in the ‘karma render properties’ node.

2-) Is there way to render the wireframes of the geometry after the tessellation takes place?

3-) Does Karma use the vector\height displacement map to drive the density of the subdivision?
For example, an area of the texture with low intensity would likely stretch less during after displacement and thus require less polygons that can be saved for other areas..