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Actually the question did arise a long time ago http://meta.wordpress.stackexchange.com/questions/369/are-bbpress-questions-off-topic-here :)

I think given total experience up to now it's fair to summarize situation as following:

  • the sheer fact of plugin/theme being involved does not make question out of scope
  • such questions can easily fall out of scope by being too localized
  • given that experts in specific extensions are much less numerous than WP in general, chances of such questions getting good answers are below average (so far)