Hi paqwak,
Thanks for your feedback.
For the short term, we plan to add distorsion and displacement nodes, but the terrain will remain a heighmap, i.e. a single height for each (x,y) point, so no vertical cliff nor cave.
We know that a lot of people are interested in lateral displacement. This is something we may consider for the mid / long term, as it's a really big feature to implement. ;-)