I have seen several instances of people sharing images that have tapered pillar supports. For instance the PreForm screenshots in this thread.
According to the Release Note log, it was introduced in PreForm 2.5.0. I am running the current version (2.10.1) and I have never seen it create tapered pillars in the current version or any of the previous versions I have used.
Is it a bug? Or do they have to be enabled some way?