Good news! I have made a couple of updates to IM4, some optimizations, fixed a couple bugs, and added some nice new text to generate from.
Most, you the user will probably not notice much of a difference. But you might be interested in trying to load a dictionary cobbled together from the collected works of Emma Goldman or the King James translation of the bible. Ngram biases have been included and there is a ton of raw text included in (the large copy) of the generator.
Check out the Data/Authors/ directory. There's some cool stuff to play with. Enjoy!