I missed the edit window, but I'm rethinking that last point. It's not clear to me yet whether the current implementation supports this, but I don't see any fun

I missed the edit window, but I'm rethinking that last point. It's not clear to me yet whether the current implementation supports this, but I don't see any fundamental reason why one couldn't extend the framework with user-defined operators, and that could make for an extremely pleasant end-user experience.