Actually 2 surface layers only provides 2 colors, 1 in each layer.
It's Power Fractals that provide a "high" and "low" color. So yes, just make more layers. This is more difficult and time consuming than a true gradient device but also much, much more versatile. If you really like this approach simply take the time to set it up once, say a 10 layer (10 control points) version, and then save it as a clip file. Then you can reuse it fairly easily later on - just import, connect, and adjust heights and colors to suit. In the future when a macro system is available you may even be able to set it up so that these values can all be adjusted in one place.
- Oshyan