Thinking about it some more, I'd like a desktop OS that not only provides extensive scripting, but also exposes system features to the language in an accessible manner. So I can easily write a GUI for my script in a few lines, or draw some crap on screen, out of the box without the bureaucracy or FFI business you'd need to do these things in Python or some other high level language.

In other words I'd like there to be a concept of OS-level "system features" available to high level languages through something a little more friendly and robust than interfacing to a C library. I don't know how I'd implement it :) but its how I'd like things to be.