I created a wrapper around the existing C# API. The provided API has key-value mechanism with all the keys and possible values documented on a webpage. My wrapper uses the original but provides all settings as classes and enums that can be discovered via IntelliSense (no need to find the documentation online any more, and no runtime-only bugs due to typo's).
Hope it is useful to someone. It can be downloaded from GitHub at /mlsomers/PdfForgePdfCreatorWrapper (I'm not allowed to post the full link here).