I would be very happy if you tell me which features are most import for your scenes, i.e. what to implement next. There are many things that I left out so far not because they are hard to implement, but just because I didn't need them.

If you know Haskell or you are determined to learn it, and you want to contribute to VOP directly (yes I know, that's very improbable), you might perhaps want me to change the license to be more open - feel free to contact me.