After working in ColdFusion for the past 8 years, I can confidently say ColdFusion is still the most progressive web application framework on the planet. I like anything that increases my productivity.
I didn't see a way to add a group to a group either but I may have missed something. I don't actually run BACFUG anymore but neither of the managers is here yet. They would be more appropriate people to add a BACFUG user.
I didn't start a profile for ACFUG, just a group for acfug. The question you pose is interesting though. How does one group join another group to essentially create a User Group directory. I'm not sure that subgrouping is a paradigm thats currently available.