One problem with Suber's Initial Rules is that they do not enforce timing - that my (sadly expired) Livejournal nomic lasted as long as it did I attribute in part to having explicit deadlines for turn-based play.

Yes. This structure is modified to immediately abstract the notion of mutability, chunk rules by abstraction so that audiences of different levels all feel like they have a focal point, and most importantly, realize from the start the idea of guiding principles for sets of rules. It's an experiment, and one of the few initial primary principles is for players to make the game ever more fun to play.