Awesome! Open source is a main interest of mine. My original account @DiggnDeeper.com is about that - trying to expand the concept of open source to anything.
Its funny you say that some sadistic people even use Blender for video editing... you found one. That's all I use. It is way better in that area now that someone is actively working on a plug-in called Power Editor (I think its called).
I don't actually currently own a mill. I'm looking for one at the moment, but I use services like ProtoLabs to do the work for me. I just try to design at the moment. Looking for a mill that I can use is a new project for me.
I do work with Open Source Ecology and we are working on mills. Hopefully, soon we will have some that will be good.
RE: Parametric Modeling in Blender is My Next Mission.