I decided to configure both the topics per page and messages per page to 1000 so that it would reduce the number of pages that are crawled, and I think as a static site, that might end up being more useful as well. It would mean, for example, that the AGI board would have all of the topics in one big long list (i.e. no pagination), and then when you click through to a particular topic, all messages for that topic would appear in one page (i.e. no pagination). The end result will basically be what Kawa has already done, but with the original YaBB SE look and feel (adjusted to look somewhat like the MT styles), and it will of course take up far more disk space.
It's been running for 42 minutes so far and has saved over 400 Meg of data. I'm expecting it to take hours to finish; may even have to leave it running overnight. I'm kind of hoping it isn't sucking down the whole Internet with it.