Is there a variable that can be adjusted for legibility?

[FrankGehry]

I've been playing around with style and bias, but I find myself wanting the writing to be a little less sloppy. Is there a variable besides style and bias that can be adjusted for this?

[FergalHennessy]

ya the author made some comments about it in his hackernews post, basically if you adjust the probability distribution to more likely then you will get more legible (on average) writing