There are plenty of feature requests for additional basis functions and we've been well aware of that lack since before the Technology Preview release. More have not been implemented yet for 2 reasons. First is simply a lack of time and the fact that other things take much greater precedence (e.g. making the renderer faster, multi-threaded, and more stable). Second is that TG2 is focused on realistic landscapes and the vast majority of other functions besides those currently available are simply not that useful for realistic terrain or texturing. They may be implemented at some point, but when considering the addition of new fractals and other generators we are generally looking at specific real-world uses for representing natural phenomena. It is intended that any such generator be fairly flexible to allow for things like the amazing "spires" work of Efflux and Volker, but still the implementation focus is on realistic, "real-world" results.
If nothing else the eventual availability of the SDK should allow others to add as many interesting basis function as they desire.
- Oshyan