Thanks. Yeah, one of the great inspirations for this project is Emacs, which I love. Emacs is so good because of the different modes that everybody can write. In the future maybe anybody can write a mode for MockMechanics (like the Avatar Mode that I keep talking about), we'll see.

Unless you are talking about the machines themselves? The copier machine for instance can be set to copy in place or not, it has a toggle button for it. So, yeah, people can build library machines with all sorts of toggles, sliders etc to tweak their behaviour, and then you can use those to build even higher machine abstractions.