Hoi, This message is late in the already long line of messages on this subject. I do not know if Robert looked at LiquidThreads. http://meta.wikimedia.org/wiki/LiquidThreads It may seem like an old article, it is around since 2004, but the likelihood of it being developed is better than 90% at this time. If you are looking for a tool for more structured debate, have a look and if you have questions of remarks please let them be known.
Thanks, GerardM