I've been really frustrated by the lack of basic functionality in these forums. With so many freely available forum apps, why use something so primitive? My main concern is the lack of a thread following/notification feature. Maybe it's here somewhere, but I've never been able to find it. If I post something and want to follow the responses, my only option now is to keep coming back every so often and see if someone answered the post.
I think you should seriously consider dumping this particular forum app and replace it with something more robust. I've used YABB before and it's very easy to set up, modify, and has a robust set of features. I know there are many others that come standard with most hosts. But as it is right now, this forum is just really poor.