I take is as an indicator that the tool is rather useless without people knowing how to use, and gaining that knowledge is non trivial. Simon is not giving many talks, LEF is pretty close, so there is only one way - the hard way of digesting Simon's blog (with all the amendments and comments).
That's a lot of work, which could be shared.
I have started, just started, putting together things I would like to see in the book. Current state of work is available in the tool repository, together with basic instructions onthe forum how to read it.
Feel invited to participate. Forks, comments, suggestions and pull requests really matter! And, since I am not native, spell & grammar corrections are deeply appreciated!