I agree with you Simone, and I thought I'd said so in my lengthy post earlier - I sympathise completely with the REAL reason why councillors don't use to forum - it's very simple, they would be publicly overwhelmed by complaints, abused with demands for their resignation and Godwin's law would be worn out.
Personally, if I were a local councillor, I simply wouldn't be prepared to deal with people who were anonymous. I would expect to discuss things face to face and know who I was talking to (like a surgery in the library) or at least have a real name, phone number, email address etc.
But instead of saying that, we are told there are technical issues - their council computers will not allow them to register / login, they find the moderation and "censorship" unacceptable etc. etc.
Clearly if Cllr Dowling is able to register and post, then the technical issues can be overcome. My tongue-in-cheek (but genuine) offer to create a separate section on the board where there would be no moderation, or they could moderate themselves would overcome concerns about "censorship".
So as far as I can see, all barriers cited can be removed. All that is left is the REAL reasons - so why skirt round it with excuses as Dave puts it. Maybe this is part of the problem that you describe?
What we could have, that may address some of CTREP's concerns, is perhaps a councillor's announcements section of the forum - it could be an area where only local councillors could post maybe, so at least they would be able to make the community aware of what is going on. The opportunity to do something is there - whether it could be made to work well I don't know, but I would be happy to give it a try as an experiment - if it failed, so be it.