Now that I'm up and running one of the things I'll be finishing is a database (Filemaker) to generate presets for different things.
While I could possibly program in some math for interpolating between points, for the most part I'll be looking at ways to quickly get the numbers from another app. Since I also use Terragen, a tool like Campath http://www2.cs.uh.edu/~somalley/campath.html
comes to mind. I already have a method to convert the data from this into tab delimited text for Terragen2 so it should be a relatively trivial process to convert this to a preset for PW. There are a few manual steps involved but it's relatively quick. I'll build it with releasing a runtime in mind if anyone else wants to play with it.