The concept of a scientist discussion forum has come up many times. From about 1999 to date I have been on an email based discussion list, though it went quiet the last seven years or so, as I think we all moved to forums as primary discussion. There was brief talk a few years back of a scientist only forum being established, I think by Cort.
I think scientists need to get more into debate, including things published in other areas. I think poor science has an influence creep, and if its allowed in one place it spreads and stains others. I also think that brainstorming, and discussion of ideas, can be very useful. I am of two minds about general community involvement.
Three reasons for excluding the community are that scientists can be left to debate without being swamped in patient commentary. The second is that patients will not be at risk of confusing speculative debate with substantive debate. The third is that sensitive information might be revealed, which might keep the debate more open. I am sure I could come up with a lot more reasons.
On the other side there are strong reasons for more inclusive and open forums. This is where science needs to go. So a science debate forum that included patients would be good.
Then there are hybrid models. These might be pushing the capacity of forum software though. The old email system I was a part of was invitation only: scientists, medical professionals (not just doctors) and invited advocates. Another idea is to have a divided forum. Science section is read only except for registered researchers, but there is a commentary section. Or perhaps this can be done with linked threads, such that posting in the main thread is very strict, but general commentary can occur in the linked thread.
Just some ideas for people to think about.