After spending more time with the software, the process has proven more difficult than expected.
Thread and forum pagination aren't detected properly by the automated algorithms, which leads to significant gaps in the downloaded archive. User details associated with each post are also captured erratically.
Manually configuring the "detection" screen has promise, however, and some headway was made with the pagination issue. It would take careful review of the forum's HTML source to get all the specifics right.
I'm also encountering an issue where the software is misreading forum links, resulting in File Not Found errors. Again, configuring the "detection" screen properly may help.
Perhaps someone else has the patience and interest to pick this up. This is still the best tool I can find for this purpose. Searching the web reveals a lot people trying to do the same thing but very few helpful answers. I did see some purported solutions which rely on Ruby or Python, but those are over my head.