Hmmm, I assume that's this? https://docs.blender.org/manual/en/latest/render/shader_nodes/vector/displacement.html and https://docs.blender.org/manual/en/latest/render/shader_nodes/vector/vector_displacement.html

That actually looks pretty useful. You could do scaling with a math node but it's a cleaner way to adjust the height and also you can shift the neutral point (I keep forgetting where it is).

I guess vector displacement is sort of equivalent to using normal maps where regular displacement is like using bump maps.