Hey Iuri,
I work with Rodrigo in the OpenACS, and we use this package (ams) a lot. I have detected some bugs myself:
We use the ams a lot to extend the registration fields, and it works pretty good. The problem you've mentioned in the other topic, I just don't have it, and I use the same version as you do. About the bugs above, I did some work in the package, and I can give it to you if you want.
Anyway, if you have doubts about the package, I think I can help you with it. There's a long time I work on the package.