Neophytos has become busy with a variety of things and at the moment isn't doing active OpenACS 4.5 work per se. But we're in contact and he hopes to find time to get involved again.
You should probably e-mail him directly to see if he has any time to contribute ideas, etc, but my suspicion is that you're probably free to pick this up if you're interested.
We also have a recent addition to the community,
Dean Des Rosier, who
though new to OpenACS 4, has an extensive background building web-based
knowledge-management systems. He's working on a "general ratings"
packages as a first step towards understanding the toolkit and providing
KM-ish facilities in it.
You might contact him, too, since I know he's interested in categorization, too.
