You're right about signatures, I have no idea where that is. Will take a look, as I know the forum does indeed support them.
As for porting over "important" threads. This is something I've done in the past, but it's non-trivial, and even more so when going from a different forum. If you're converting the entire forum from one type of forum to another, there are generally conversion scripts that can be used to do so. These scripts pull everything over -- users, forums, posts, attachments, private messages, and so forth. If you're just trying to move threads, you need to match up users on the new site with users on the old site. And you certainly will not have all the people from the old site who posted in those threads registered on the new site.
Before anything like that could even happen, though, I'd need a copy of the MoJo forum database. I'm not sure how realistic that is at this point.
It certainly would be possible to transplant the whole Austin VooDoo forum, but you'd have the same problems as described above. To do it properly you'd need to migrate any accounts that were active in any VooDoo threads, while omitting users who have already registered on this site (you could try matching up via email and/or username, and neither are necessarily foolproof).
..Al