Peter,
I'm new to OpenACS and .LRN, but as I've tried troubleshooting my .LRN installation I've noticed that my issues are split almost 50/50 between something to do with OpenACS and something specific to .LRN. Whether this extrapolates to a larger audience, I'm not sure.
I guess what I'm saying is that some people who have issues with either system aren't going to be able to distinguish if it's part of the OpenACS framework or part of something .LRN itself is providing. This may be reason to keep OpenACS and .LRN Q&A together, however the volume may be too great to do so.
I just wanted to mention that though because I'd hate to be volleyed back and forth between forums on an issue I have 😉